Try /Z7 on Windows builds.

Right now /FS and /Zi together serialize debug information
into .pdb files through another process.

I tried just dropping /FS, so that each cl.exe instance
writes to the .pdb file directly, but the bots don't like that.

Instead, let's try switching /Zi to /Z7, to embed debug information
directly into the object file instead of alongside in a .pdb.

This is all about trying to improve build times.

https://docs.microsoft.com/en-us/cpp/build/reference/z7-zi-zi-debug-information-format
https://docs.microsoft.com/en-us/cpp/build/reference/fs-force-synchronous-pdb-writes

Change-Id: If636f8fa21c639eff81d9c335c5223908c0fdcea
Reviewed-on: https://skia-review.googlesource.com/85661
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed