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Microsoft rc.exe has its built-in preprocessor that has a limit of 32
characters for macro names.

We already use clang-cl's preprocessor for our own rc that we use in cross
builds. That works well, so feed the output from that into Microsoft
rc.exe too.

This allows removing some workarounds for BUILDFLAG() use in .rc files and
shouldn't change behavior.

Bug: 961769
Change-Id: I21ea2e62323a27c61f8c79c267814ed2f522eded
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860097
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705630}