#include <Python.h>, not <Python/Python.h>. The latter results in

the build being broken for people using the public Mac OS X 10.9 SDK, 
which does not have the Python framework any longer.  The Xcode project
file already sets the -I and -L flags correctly so that <Python.h> and
-lpython will work correctly with the system's installed Python.

llvm-svn: 196259