Fix build on windows.

Should clang have a config.h or should we use the config.h of llvm or using the preprocessor is OK?  I did a quick fix here, but having a guideline on how to handle non portable function would be great (or ask ted to stop breaking the windows build :)).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65233 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed