Refactor Windows C++ toolchain selection

We used to have --cpu=x64_windows_msys for selecting msys gcc toolchain,
this is a misuse of --cpu flag.

Instead, we should use --compiler flag to select C++ toolchain.
For example, --compiler=msvc-cl, --compiler=msys-gcc, --compiler=mingw-gcc

After this change, we can use mingw gcc toolchain by following steps:
1. In MSYS, install mingw by `pacman -S mingw-w64-x86_64-gcc`
2. Add /mingw64:/mingw64/bin into PATH
3. build with --compiler=mingw-gcc

Related:
https://github.com/bazelbuild/rules_go/issues/736

Change-Id: I4b5f77ce0698cfcafefe5d2ab17657f9c9e295d3
PiperOrigin-RevId: 180678829
4 files changed
tree: 6295621a45a61fe7f54bc1511a578eb3dc9a5d68
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.py
  13. combine_distfiles_to_tar.sh
  14. compile.sh
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. ISSUE_TEMPLATE.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
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