Fix Clang build after r109734
Fix Clang build after r109734

The Clang <limits.h> doesn't behave normally under -ffreestanding,
but we needed that flag for another reason.  So explicitly undefine
and redefine __STDC_HOSTED__ even though we're using -ffreestanding.

TBR=nduca@google.com

BUG= none
TEST= none

Review URL: http://codereview.chromium.org/8538030

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109735 0039d316-1c4b-4281-b951-d872f2087c98

adobe/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,adobe/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,yitian134/chromium