Remove a reference to __DATE__ from yasm for non official builds.

R=maruel@chromium.org
TBR=hclam@chromium.org
BUG=

Review URL: https://codereview.chromium.org/759653005

Cr-Original-Commit-Position: refs/heads/master@{#305876}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: d6dc32712273697cabc01d3be99ae5a5442b4a72
2 files changed