inttypes: force correct mingw PRIdMAX even without <stdio.h>
The mingw trick of using __USE_MINGW_ANSI_STDIO only changes the
definitions in <inttypes.h> if <stdio.h> is also included. But
since we want to always use the __gnu_printf__ flavor when
available, we want to make sure that including <inttypes.h> in
isolation will give the desired "lld" answer.
Reported by Assaf Gordon.
* modules/inttypes (Depends-on): Require extensions, so that mingw
always uses GNU style inttypes.
* lib/inttypes.in.h: On mingw, include <stdio.h>.