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tigercosmos 43043a6361 servo: Merge #18145 - fix windows build issue #18055 (from tigercosmos:master); r=larsbergstrom

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With some reasons, the windows and VS environment do not set the `env("PLATFORM")` variable.
So, there's no need to check the variable, and set `os_type` equl to `pc-windows-msvc` as default. Then the script can get correct url to download `rustc`.

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- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #18055 (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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Source-Repo: https://github.com/servo/servo
Source-Revision: 5e3c4c21986b10ac7292d75245e57700f5075b1a

2017-10-16 09:38:01 -05:00