Auto merge of #28497 - servo:dependabot/cargo/pkg-config-0.3.19, r=jdm

Bump pkg-config from 0.3.14 to 0.3.19

Bumps [pkg-config](https://github.com/rust-lang/pkg-config-rs) from 0.3.14 to 0.3.19.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/rust-lang/pkg-config-rs/blob/master/CHANGELOG.md">pkg-config's changelog</a>.</em></p>
<blockquote>
<h2>[0.3.19] - 2020-10-13</h2>
<h3>Added</h3>
<ul>
<li>
<p>Add <code>README.md</code> to be displayed on crates.io (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/111">#111</a>).</p>
</li>
<li>
<p>Support for <code>-isystem</code>, <code>-iquote</code> and <code>-idirafter</code> include flags (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/115">#115</a>).</p>
</li>
</ul>
<h3>Changed</h3>
<ul>
<li>
<p>Improve documentation for cross-compilation (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/113">#113</a>).</p>
</li>
<li>
<p>Allow overriding system root via the <code>PKG_CONFIG_SYSROOT_DIR</code> or <code>SYSROOT</code>
environment variable (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/82">#82</a>).</p>
</li>
</ul>
<h2>[0.3.18] - 2020-07-11</h2>
<h3>Fixed</h3>
<ul>
<li>Use <code>env::var_os()</code> almost everywhere to handle non-UTF8 paths in
environment variables, and also improve error handling around environment
variable handling (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/106">#106</a>).</li>
</ul>
<h3>Changed</h3>
<ul>
<li>Default the <code>env_metadata</code> build parameter to <code>true</code> instead of <code>false</code>.
Whenever a pkg-config related environment variable changes it would make
sense to rebuild crates that use pkg-config, or otherwise changes might not
be picked up. As such the previous default didn't make much sense (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/105">#105</a>).</li>
</ul>
<h2>[0.3.17] - 2019-11-02</h2>
<h3>Fixed</h3>
<ul>
<li>Fix support for multiple version number constraints (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/95">#95</a>)</li>
</ul>
<h2>[0.3.16] - 2019-09-09</h2>
<h3>Changed</h3>
<ul>
<li>Stop using deprecated functions and require Rust 1.30 (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/84">#84</a>)</li>
</ul>
<h3>Fixed</h3>
<ul>
<li>Fix repository URL in README.md</li>
<li>Fix various clippy warnings</li>
</ul>
<h3>Added</h3>
<ul>
<li>Run <code>cargo fmt</code> as part of the CI (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/89">#89</a>)</li>
<li>Derive <code>Clone</code> for <code>Library</code> and <code>Debug</code> for `Config (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/91">#91</a>)</li>
<li>Add support for <code>PKG_CONFIG_ALLOW_SYSTEM_CFLAGS</code> and enable by default (<a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/93">#93</a>)</li>
</ul>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="5432578581"><code>5432578</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/116">#116</a> from rust-lang/release-0.3.19</li>
<li><a href="370b02adf3"><code>370b02a</code></a> Release 0.3.19</li>
<li><a href="9d276aeafb"><code>9d276ae</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/115">#115</a> from rust-lang/isystem</li>
<li><a href="948f45f1f5"><code>948f45f</code></a> Remove unneeded Iterator::collect() and directly work on the iterator instead</li>
<li><a href="76df4d8aa7"><code>76df4d8</code></a> Add support for -isystem, -iquote, -idirafter include flags</li>
<li><a href="7a442bed3f"><code>7a442be</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/82">#82</a> from danielverkamp/sysroot</li>
<li><a href="e94a5336cd"><code>e94a533</code></a> Don't use /usr as fallback sysroot on Windows</li>
<li><a href="81468be084"><code>81468be</code></a> Allow overriding system root via environment</li>
<li><a href="070b4e9e9c"><code>070b4e9</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/pkg-config-rs/issues/113">#113</a> from kornelski/crossdocs</li>
<li><a href="147e102e9c"><code>147e102</code></a> Improve docs for cross-compilation</li>
<li>Additional commits viewable in <a href="https://github.com/rust-lang/pkg-config-rs/compare/0.3.14...0.3.19">compare view</a></li>
</ul>
</details>
<br />

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Cargo.lock

@@ -4641,9 +4641,9 @@ dependencies = [
 
 [[package]]
 name = "pkg-config"
-version = "0.3.14"
+version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "676e8eb2b1b4c9043511a9b7bea0915320d7e502b0a079fb03f9635a5252b18c"
+checksum = "3831453b3449ceb48b6d9c7ad7c96d5ea673e9b470a1dc578c2ce6521230884c"
 
 [[package]]
 name = "plane-split"