Removed a dead variable and a dead include

modules/libpref/src/unix/unixpref.c

@@ -28,11 +28,8 @@
 #include "jsapi.h"
 #include "jsbuffer.h"
 #include "xpassert.h"
-#include "fe_proto.h"
 
 
-static struct fe_icon_type* splash_screen = NULL;
-
 /*
  * pref_InitInitialObjects
  * Needed by PREF_Init.