- made sysCallbacks a value variable instead of a pointer to simplify the checks for it.

src/common/engine/i_interface.cpp

@@ -1,7 +1,7 @@
 #include "i_interface.h"
 
 // Some global engine variables taken out of the backend code.
-SystemCallbacks *sysCallbacks;
+SystemCallbacks sysCallbacks;
 FString endoomName;
 bool batchrun;
 float menuBlurAmount;