blkid: fix building e2fsprogs with internal libblkid

blkid: fix building e2fsprogs with internal libblkid

Building e2fsprogs with the internal libblkid fails for me with the
following compiler error:

	In file included from blkidP.h:27:0,
			 from dev.c:17:
	dev.c: In function ‘blkid_free_dev’:
	../../lib/blkid/list.h:149:42: error: ‘intptr_t’ undeclared (first use in this function); did you mean ‘__intptr_t’?
	  ((type *)((char *)(ptr)-(unsigned long)(intptr_t)(&((type *)0)->member)))

The problem is that lib/blkid/list.h is now using 'intptr_t', but
stdint.h is not guaranteed to have been included yet.  Include it.

[ Changed to use inttypes.h if it is available and fall back to stdint.h
  if it is not available - tytso ]

Fixes: 0a3d8041892c ("AOSP: build mke2fs for windows using android mingw library")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>