Add support for win64 flags to yasm.

This change is needed to add win64 support to libvpx.

BUG=166496, 170672


Review URL: https://chromiumcodereview.appspot.com/11971037

Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: d661f0522c34389d2a330d4b4ea12366127892fc
1 file changed
tree: f894e3abfface3fd0c0f121193906d342e08c955
  1. README.chromium
  2. source/
  3. yasm.gyp
  4. yasm_compile.gypi