Fix with irrlicht 1.8: irr::u64 is already typedef'd in irrTypes.h.

ok sthen@

games/minetest/patches/patch-src_irrlichttypes_h

@@ -0,0 +1,14 @@
+$OpenBSD: patch-src_irrlichttypes_h,v 1.1 2012/11/24 14:55:30 pascal Exp $
+
+typedef is already provided by irrTypes.h
+
+--- src/irrlichttypes.h.orig	Sat Nov 24 15:14:18 2012
++++ src/irrlichttypes.h	Sat Nov 24 15:14:39 2012
+@@ -30,7 +30,6 @@ using namespace irr;
+ #else
+ 	// Posix
+ 	#include <stdint.h>
+-	typedef uint64_t u64;
+ 	//typedef unsigned long long u64;
+ #endif
+