Integrate the patch from expat.h 1.51; needed for some C compilers. Closes SF bug #680797.
Integrate the patch from expat.h 1.51; needed for some C compilers.
Closes SF bug #680797.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator