v8 clang/win: Stop passing /FIIntrin.h

See https://codereview.chromium.org/2076483002 for a lengthy reasoning.
The two mysterious files called out there were in boringssl and nacl,
so for v8 this should be a complete no-op.

BUG=chromium:592745

Review-Url: https://codereview.chromium.org/2099843002
Cr-Commit-Position: refs/heads/master@{#37272}

gypfiles/standalone.gypi

@@ -987,10 +987,6 @@
                   # pattern.
                   '-Wno-missing-field-initializers',
 
-                  # Many files use intrinsics without including this header.
-                  # TODO(hans): Fix those files, or move this to sub-GYPs.
-                  '/FIIntrin.h',
-
                   # TODO(hans): Make this list shorter eventually, http://crbug.com/504657
                   '-Qunused-arguments',  # http://crbug.com/504658
                   '-Wno-microsoft-enum-value',  # http://crbug.com/505296