Stop setting mac_xcode_version in DEPS
Stop setting mac_xcode_version in DEPS

mac_xcode_version no longer has an effect.

Partially reverts https://chromium-review.googlesource.com/c/libyuv/libyuv/+/2384320

Bug: chromium:1147839
Change-Id: Ia0686a209e3b3497c1fe6c1593689064eaf73007
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/2547120
Reviewed-by: Nico Weber <c0f02d98506190746d1cdcb01be0f37b51e27077@chromium.org>

lemenkov/libyuv,lemenkov/libyuv,lemenkov/libyuv,lemenkov/libyuv