fixes to pre_libc.py script to correctly strip x64
object files from libcmt during 64bit build


BUG=166496


Review URL: https://chromiumcodereview.appspot.com/12303010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@183908 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed