Auto merge of #11967 - metajack:windows-package, r=larsbergstrom

Add Windows packaging to create an MSI installer

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

<!-- Either: -->
- [ ] There are tests for these changes OR
- [x] These changes do not require tests because they require manual testing

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11967)
<!-- Reviewable:end -->

components/servo/.cargo/config

@@ -9,3 +9,6 @@ ar = "arm-linux-gnueabihf-ar"
 [target.aarch64-unknown-linux-gnu]
 linker = "aarch64-linux-gnu-gcc"
 ar = "aarch64-linux-gnu-ar"
+
+[target.'cfg(target_os=windows)']
+linker = "./fake-ld.cmd"

components/servo/fake-ld.cmd

@@ -0,0 +1,2 @@
+@echo off
+gcc -mwindows %*