backport change from the iaxclient sf repository rev 558 (correct ifdef this time)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5152 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/iax/src/md5.h

 #ifndef MD5_H
 #define MD5_H
 
-#ifdef __alpha || defined(__x86_64)
+#if defined(__alpha) || defined(__x86_64)
 typedef unsigned int uint32;
 #else
 typedef unsigned long uint32;