Disable libc++ on Windows/cl.exe and Windows/libfuzzer

Windows/libc++ has been in the tree for about 1.5 days now and fortunately the
only real failures are timeouts.  Rather than reverting and disabling libc++
everywhere, instead selectively disable it for the configurations that are
having issues.

Specifically, the V8 cl.exe build has broken, so disable libc++ there.  Several
Windows fuzzers are timing out, so temporarily disable libc++ for libfuzzer.

BUG=801780,942915,942939
R=thakis

Change-Id: I9dd0d4c435f499c8e7cf05cdf14bb0fc2829fa15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1527776
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641507}
1 file changed