Upcast size_t variables to uintmax_t when printing

When printing variables which contain a size, today "unsigned long"
is used at many places.
In order to be able to change the type from "unsigned long" into size_t
some day in the future, we need to have a way to print 64 bit variables
on a system that has "unsigned long" defined to be 32 bit, like Win64.

Upcast all those variables into uintmax_t before they are printed.
This is to prepare for a bigger change, when "unsigned long"
will be converted into size_t for variables which may be > 4Gib.

Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff.c

@@ -3227,7 +3227,7 @@ static void emit_binary_diff_body(struct diff_options *o,
 	}
 
 	if (delta && delta_size < deflate_size) {
-		char *s = xstrfmt("%lu", orig_size);
+		char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
 		emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
 				 s, strlen(s), 0);
 		free(s);