Fix detection whether the system is big endian

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 45ad86d922)

src/GeoIP-1.4.0/libGeoIP/md5.c

@@ -23,6 +23,8 @@
 /* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.  */
 /* Heavily modified for GnuPG by <wk@gnupg.org> */
 
+#include "config.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>