BGE: Call DNA_sdna_current_init when launching blenderplayer.

Don't calling DNA_sdna_current_init was creating a crash because a global uninitialized
variable was used when reading blender files.

source/gameengine/GamePlayer/ghost/GPG_ghost.cpp

@@ -61,6 +61,7 @@ extern "C"
 
 #include "DNA_scene_types.h"
 #include "DNA_userdef_types.h"
+#include "DNA_genfile.h"
 
 #include "BLO_readfile.h"
 #include "BLO_runtime.h"
@@ -492,6 +493,8 @@ int main(
 	// freeing up GPU_Textures works correctly.
 	BLI_threadapi_init();
 
+	DNA_sdna_current_init();
+
 	RNA_init();
 
 	init_nodesystem();