Use fixed-size integers for the on-disk pack structure.

Plain integer types without a fixed size can vary between platforms.  Even
though all common platforms use 32-bit ints, there is no guarantee that
this won't change at some point.  Furthermore, specifying an integer type
with explicit size makes the definition of structures more obvious.

Signed-off-by: Simon 'corecode' Schubert <corecode@fs.ei.tum.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-compat-util.h

@@ -46,6 +46,7 @@
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <pwd.h>
+#include <stdint.h>
 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 #include <grp.h>
 #define _ALL_SOURCE 1