[ndk] Fix build error on GCC/Clang + STLport.

* Add missing #include <cctype> since STLport has different
  implementation that <cctype> won't be included indirectly.

* Add missing cast from enum value to unsigned int. Otherwise
  GCC 4.6 will bump a compile error w/ -pedantic flag.

Conflicts:

	lib/Archive/ArchiveReader.cpp
	lib/Object/COFFObjectFile.cpp
	lib/Target/PowerPC/PPCRegisterInfo.cpp
	tools/bugpoint/CrashDebugger.cpp
	unittests/Support/IntegersSubsetTest.cpp

Change-Id: I61fac1230f0b79b5227033cae69f80bf162ce607