WL#5030: Split and remove mysql_priv.h

This patch:

- Moves all definitions from the mysql_priv.h file into
  header files for the component where the variable is
  defined
- Creates header files if the component lacks one
- Eliminates all include directives from mysql_priv.h
- Eliminates all circular include cycles
- Rename time.cc to sql_time.cc
- Rename mysql_priv.h to sql_priv.h

include/my_dbug.h

@@ -145,7 +145,23 @@ extern  const char* _db_get_func_(void);
 #define DBUG_CRASH_VOID_RETURN          do { return; } while(0)
 
 #endif
-#ifdef  __cplusplus
+
+#ifdef EXTRA_DEBUG
+/**
+  Sync points allow us to force the server to reach a certain line of code
+  and block there until the client tells the server it is ok to go on.
+  The client tells the server to block with SELECT GET_LOCK()
+  and unblocks it with SELECT RELEASE_LOCK(). Used for debugging difficult
+  concurrency problems
+*/
+#define DBUG_SYNC_POINT(lock_name,lock_timeout) \
+ debug_sync_point(lock_name,lock_timeout)
+void debug_sync_point(const char* lock_name, uint lock_timeout);
+#else
+#define DBUG_SYNC_POINT(lock_name,lock_timeout)
+#endif /* EXTRA_DEBUG */
+
+#ifdef	__cplusplus
 }
 #endif
 #endif