Exclude filter_yuv_mmx.cc from x64 on MSVC prior to 2012

Minor follow-up fix to r179379. Linking content fails otherwise, because MMX intrinsics aren't supported.

TBR=scherkus
BUG=172129, 166496

Review URL: https://chromiumcodereview.appspot.com/12183011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180331 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed