Fix bootstrap error on Ubuntu 20.10
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Bump smallvec from 1.5.1 to 1.6.1
Bumps [smallvec](https://github.com/servo/rust-smallvec) from 1.5.1 to 1.6.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/servo/rust-smallvec/releases">smallvec's releases</a>.</em></p>
<blockquote>
<h2>v1.6.1</h2>
<ul>
<li>Fix a possible buffer overflow in <code>insert_many</code> (<a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/252">#252</a>, <a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/254">#254</a>).</li>
</ul>
<h2>v1.6.0</h2>
<ul>
<li>The <code>"union"</code> feature is now compatible with stable Rust 1.49 (<a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/248">#248</a>, <a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/247">#247</a>).</li>
<li>Fixed warnings when compiling with Rust 1.51 nightly (<a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/242">#242</a>, <a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/246">#246</a>).</li>
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<li><a href="4e53e07280"><code>4e53e07</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/254">#254</a> - mbrubeck:overflow, r=emilio</li>
<li><a href="9998ba0694"><code>9998ba0</code></a> Fix potential buffer overflow in <code>insert_many</code></li>
<li><a href="0b2b4e53a5"><code>0b2b4e5</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/249">#249</a> - mbrubeck:bump, r=jdm</li>
<li><a href="7ec5548c1b"><code>7ec5548</code></a> Version 1.6.0</li>
<li><a href="73a8953835"><code>73a8953</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/248">#248</a> - saethlin:master, r=mbrubeck</li>
<li><a href="2785548293"><code>2785548</code></a> make union feature work on 1.50</li>
<li><a href="f5f1a22c76"><code>f5f1a22</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/246">#246</a> - mbrubeck:warnings, r=jdm</li>
<li><a href="d00f4d4736"><code>d00f4d4</code></a> Silence warnings about deprecated LayoutErr</li>
<li><a href="e4c73e4cac"><code>e4c73e4</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-smallvec/issues/242">#242</a> - c410-f3r:patch-2, r=mbrubeck</li>
<li><a href="2964a8469b"><code>2964a84</code></a> Remove <code>min_const_generics</code> feature</li>
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Bump byteorder from 1.3.4 to 1.4.2
Bumps [byteorder](https://github.com/BurntSushi/byteorder) from 1.3.4 to 1.4.2.
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<li><a href="ca8c10a3f8"><code>ca8c10a</code></a> 1.4.2</li>
<li><a href="54ca336ec2"><code>54ca336</code></a> crates.io: no_std -> no-std</li>
<li><a href="5617f231eb"><code>5617f23</code></a> 1.4.1</li>
<li><a href="0ead1057d4"><code>0ead105</code></a> impl: fix read implementations</li>
<li><a href="cf0253a63e"><code>cf0253a</code></a> 1.4.0</li>
<li><a href="37daff6927"><code>37daff6</code></a> impl: use std endian conversion routines</li>
<li><a href="aa7c5b25ad"><code>aa7c5b2</code></a> msrv: bump to 1.41.1</li>
<li><a href="8061190ab6"><code>8061190</code></a> deps: update to quickcheck 0.9 and rand 0.7</li>
<li><a href="6dac6ebe13"><code>6dac6eb</code></a> crates.io: add no_std in categories</li>
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Bump linked-hash-map from 0.5.3 to 0.5.4
Bumps [linked-hash-map](https://github.com/contain-rs/linked-hash-map) from 0.5.3 to 0.5.4.
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Bump tendril from 0.4.1 to 0.4.2
Bumps [tendril](https://github.com/servo/tendril) from 0.4.1 to 0.4.2.
<details>
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<li><a href="548cfaab79"><code>548cfaa</code></a> Bump to 0.4.2</li>
<li><a href="9532724c32"><code>9532724</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/tendril/issues/46">#46</a> - xfix:resolve-ub, r=jdm</li>
<li><a href="e379f85472"><code>e379f85</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/tendril/issues/49">#49</a> - xfix:upgrade-futf, r=jdm</li>
<li><a href="3367e11208"><code>3367e11</code></a> Update futf to 0.1.2</li>
<li><a href="9e6da0d31d"><code>9e6da0d</code></a> Resolve UB found by miri</li>
<li><a href="08f7f292ab"><code>08f7f29</code></a> cargo fmt</li>
<li><a href="dc22ac0e1d"><code>dc22ac0</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/tendril/issues/43">#43</a> - xfix:use-non-zero-usize-from-standard-library, r=SimonSapin</li>
<li><a href="527347768b"><code>5273477</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/tendril/issues/45">#45</a> - servo:warnings, r=nox</li>
<li><a href="869dfbd22c"><code>869dfbd</code></a> Test a minimum Rust version on CI</li>
<li><a href="604caf6d13"><code>604caf6</code></a> New inclusive range syntax</li>
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Bump thread_local from 1.0.1 to 1.1.0
Bumps [thread_local](https://github.com/Amanieu/thread_local-rs) from 1.0.1 to 1.1.0.
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<li><a href="d9e93cbc8b"><code>d9e93cb</code></a> Bump version to 1.1.0</li>
<li><a href="1ac832a099"><code>1ac832a</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/Amanieu/thread_local-rs/issues/22">#22</a> from Koxiaet/list</li>
<li><a href="ef33f172f2"><code>ef33f17</code></a> Deprecate CachedThreadLocal</li>
<li><a href="34edea055d"><code>34edea0</code></a> Fix running benchmarks on CI</li>
<li><a href="fe072dcfcb"><code>fe072dc</code></a> Use a concurrent vector</li>
<li><a href="0b0830efed"><code>0b0830e</code></a> Fix testing on 1.28.0</li>
<li><a href="6c744de251"><code>6c744de</code></a> Skip benchmarking on 1.28.0</li>
<li><a href="d7b2b1d6a6"><code>d7b2b1d</code></a> Use criterion for benchmarks and add more of them</li>
<li><a href="6e46d4f23c"><code>6e46d4f</code></a> Reverse the thread id binary heap</li>
<li><a href="14c5889b5b"><code>14c5889</code></a> Save space with NonNull instead of a raw pointer</li>
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Bump build-parallel from 0.1.1 to 0.1.2
Bumps [build-parallel](https://github.com/jrmuizel/build-parallel) from 0.1.1 to 0.1.2.
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Clean up the code to BOM sniff.
See https://github.com/servo/servo/pull/28006#discussion_r551968553
cc @CYBAI
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