Tell clang/win to emulate MSVC 2015

By default it emulates your installed cl.exe, but the bots don't have
one.  I think the fallback is 2013, which causes all sorts of pre-C++11
problems.

CQ_INCLUDE_TRYBOTS=skia.primary:Build-Win-Clang-x86_64-Release

Change-Id: I2556abe68825e58762b4172d067ba6826de5c133
Reviewed-on: https://skia-review.googlesource.com/29021
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed