__FUNCTION__ is not available everywhere.

make us see at least with gcc the function proto. this can be extended
probably for windows too.
Fix build on intelxeon3 (sun compiler and others)

sql/event_scheduler.cc

@@ -236,9 +236,16 @@
   about conditional variables used.
 */
 
+#ifdef __GNUC__
+#if __GNUC__ >= 2
+#define SCHED_FUNC __FUNCTION__
+#endif
+#else
+#define SCHED_FUNC "<unknown>"
+#endif
 
-#define LOCK_SCHEDULER_DATA()   lock_data(__FUNCTION__,__LINE__)
-#define UNLOCK_SCHEDULER_DATA() unlock_data(__FUNCTION__,__LINE__)
+#define LOCK_SCHEDULER_DATA()   lock_data(SCHED_FUNC, __LINE__)
+#define UNLOCK_SCHEDULER_DATA() unlock_data(SCHED_FUNC, __LINE__)
 
 
 #ifndef DBUG_OFF