Fix UINT4 type definition for AMD64. Will also work on 32 bit architecture.

--- md5auth/global.h	2002-09-27 14:16:24.000000000 +0200
+++ md5auth/global.h	2008-10-26 16:04:38.000000000 +0100
@@ -17,7 +17,7 @@
 typedef unsigned short int UINT2;
 
 /* UINT4 defines a four byte word */
-typedef unsigned long int UINT4;
+typedef unsigned int UINT4;
 
 /* PROTO_LIST is defined depending on how PROTOTYPES is defined above.
 If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it