DB/Events: Allow linking a guid to more than one event (changes game_event_creature/gameobject PKs)

sql/updates/world/2011_09_28_02_world_game_event.sql

@@ -0,0 +1,2 @@
+ALTER TABLE `game_event_creature` DROP PRIMARY KEY, ADD PRIMARY KEY (`guid`,`eventEntry`);
+ALTER TABLE `game_event_gameobject` DROP PRIMARY KEY, ADD PRIMARY KEY (`guid`,`eventEntry`);