* libc/include/stdint.h (WCHAR_MIN): Copy definition from wchar.h.
	(WCHAR_MAX): Ditto.
	* libc/include/wchar.h (WCHAR_MIN): Add comment.
	(WCHAR_MAX): Ditto.
	* libc/include/stdint.h (WCHAR_MIN): Copy definition from wchar.h.
	(WCHAR_MAX): Ditto.
	* libc/include/wchar.h (WCHAR_MIN): Add comment.
	(WCHAR_MAX): Ditto.