tree de95a61a02f5bef96aa547fc9622d1401fac0e5b
parent 0c0837d913afd74fcb9d7d3afae3d0a4124d1fe7
author thakis <thakis@chromium.org> 1488582875 -0800
committer Commit bot <commit-bot@chromium.org> 1488582875 +0000

win: Decide how to include system dirs at toolchain time instead of globally.

Before this patch, we used the global is_clang setting to decide if
we include system libraries via /I or -imsvc in the clang toolchains.
Now, always use -imsvc in the clang toolchains.

The motivation is that we (maybe) want to build libyuv with a clang
toolchain even when is_clang is globally set to false.

BUG=692600

Review-Url: https://codereview.chromium.org/2728233002
Cr-Original-Commit-Position: refs/heads/master@{#454704}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: cbdbc2fd19dcde3cf06296bb9bad8f41978214b5