BUG=349
TESTED=c:\mingw64\bin\x86_64-w64-mingw32-c++.exe -m32 -I include source/cpu_id.cc -c -o cpu_id.o
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/17139004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1049 16f28f9a-4ce2-e073-06de-1de4eb20be90