test _MSC_VER in SkCpu

We're looking to use tools provided by the compiler toolchain,
not by the OS, so the proper check is for MSVC (or compatible
clang-cl) not for Windows.  E.g. MinGW wants the #else path.

Change-Id: Iefc43a857a1f6438c9145d7503a42c0646c5cbf1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/270096
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed