Merge menu_driver.c into retroarch.c - yes, it's even bigger I know,

this is so that we can consolidate global state and then start splitting
things up across several files

Makefile.common

@@ -829,8 +829,7 @@ ifeq ($(HAVE_SHADERS_COMMON), 1)
 endif
 
 ifeq ($(HAVE_MENU_COMMON), 1)
-   OBJ += menu/menu_driver.o \
-          menu/menu_setting.o \
+   OBJ += menu/menu_setting.o \
           menu/widgets/menu_filebrowser.o \
           menu/widgets/menu_dialog.o \
           menu/widgets/menu_input_bind_dialog.o \

griffin/griffin.c

@@ -1286,7 +1286,6 @@ MENU
 #include "../input/input_osk.c"
 
 #ifdef HAVE_MENU
-#include "../menu/menu_driver.c"
 #include "../menu/menu_setting.c"
 #include "../menu/menu_cbs.c"