Checked in patch for bug 254865: crash if I try to add new event or task

calendar/libxpical/md5.h

@@ -1,7 +1,7 @@
 #ifndef MD5_H
 #define MD5_H
 
-#ifdef __alpha
+#if defined(__alpha) || defined(__x86_64)
 typedef unsigned int uint32;
 #else
 typedef unsigned long uint32;