Fix Windows clang CI for CC toolchain resolution

[jsharpe]

Select the correct toolchain and platform for
building with clang on windows with CC toolchain
resolution active.

Attempting to fix #876

[jsharpe]

@comius @meteorcloudy I think this should fix the incompatible_enable_cc_toolchain_resolution build for this package.

[codecov-commenter]

Codecov Report

Merging #877 (0dfb5eb) into master (05fbc65) will increase coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #877      +/-   ##
==========================================
+ Coverage   73.29%   73.62%   +0.32%     
==========================================
  Files          17       17              
  Lines        3292     3298       +6     
==========================================
+ Hits         2413     2428      +15     
+ Misses        879      870       -9     

Impacted Files	Coverage Δ
src/logging.cc	75.05% <0.00%> (+0.14%)	⬆️
src/symbolize.cc	66.76% <0.00%> (+2.64%)	⬆️

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[drigz]

Thanks, buildkite logs look good! Do you know if --incompatible_enable_cc_toolchain_resolution is already the default at head, or should we run a build explicitly setting --incompatible_enable_cc_toolchain_resolution to check this?

[comius]

Do you know if --incompatible_enable_cc_toolchain_resolution is already the default at head, or should we run a build explicitly setting --incompatible_enable_cc_toolchain_resolution to check this?

It's false at head, you need to set it manually.

[drigz]

Many thanks, Ivo. I explicitly enabled it for a test build and it seems happy: https://buildkite.com/bazel/google-logging/builds/3010#0184c7ce-6aa4-4803-8e30-50ab4834352f