- fixed GCC warnings and errors

(Is there anyway to tone down GCC's warning level? It outputs too many false positives for potentially uninitialized variables in which the genuine errors get drowned.)

src/g_level.cpp

@@ -91,6 +91,7 @@
 
 #include "g_hub.h"
 #include "g_levellocals.h"
+#include "actorinlines.h"
 
 #include <string.h>