Add externs to interface and class headers.

Signed-off-by: aixxe <me@aixxe.net>

include/cstrike/Interfaces/IGameEventManager2.h

@@ -45,4 +45,6 @@ class IGameEventManager2 {
 		virtual void FreeEvent(IGameEvent* event) = 0;
 		virtual bool SerializeEvent(IGameEvent* event, bf_write* buf) = 0;
 		virtual IGameEvent* UnserializeEvent(bf_read* buf) = 0;
-};
+};
+
+extern IGameEventManager2* gameevents;