Revert "Replace zero-length array decls with []."

This reverts 6c5f9baa3b commit, whose
change breaks gcc-2.95.

Not that I ignore portability to compilers that are properly C99, but
keeping compilation with GCC working is more important, at least for
now.  We would probably end up declaring with "name[1]" and teach the
allocator to subtract one if we really aimed for portability, but that
is left for later rounds.

Signed-off-by: Junio C Hamano <junkio@cox.net>

server-info.c

@@ -70,7 +70,7 @@ static struct pack_info {
 	int nr_alloc;
 	int nr_heads;
 	unsigned char (*head)[20];
-	char dep[]; /* more */
+	char dep[0]; /* more */
 } **info;
 static int num_pack;
 static const char *objdir;