fix long on lp64

--- upstream/mame/src/osd/osdcomm.h 2012-02-15 21:32:04.000000000 +0100
+++ mame/src/osd/osdcomm.h  2012-02-15 21:18:14.000000000 +0100
@@ -137,9 +137,14 @@
 typedef unsigned __int64                   UINT64;
 #else
 __extension__ typedef unsigned long long   UINT64;
+/*long is 64 bits on LP64 (Unix) platforms */
+#ifdef __LP64__
+__extension__ typedef signed long          INT64;
+#else
 __extension__ typedef signed long long     INT64;
 #endif
 #endif
+#endif

 #endif