(Menu) Implement 'null' menu driver

Makefile.common

@@ -325,7 +325,8 @@ ifeq ($(HAVE_MENU_COMMON), 1)
 			 menu/menu_entries_cbs_contentlist_switch.o \
 			 menu/menu_entries_cbs.o \
 			 menu/menu_list.o \
-			 menu/menu_animation.o
+			 menu/menu_animation.o \
+			 menu/drivers/null.o
 endif
 
 ifeq ($(HAVE_FREETYPE), 1)

griffin/griffin.c

@@ -696,8 +696,11 @@ MENU
 #include "../menu/menu_navigation.c"
 #include "../menu/menu_animation.c"
 #include "../menu/menu_database.c"
+
+#include "../menu/drivers/null.c"
 #endif
 
+
 #ifdef HAVE_RMENU
 #include "../menu/drivers/rmenu.c"
 #endif

menu/drivers/null.c

@@ -0,0 +1,52 @@
+/*  RetroArch - A frontend for libretro.
+ *  Copyright (C) 2014-2015 - Jay McCarthy
+ *
+ *  RetroArch is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ *  PURPOSE.  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with RetroArch.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "../menu_driver.h"
+#include "../menu.h"
+#include "../../general.h"
+
+menu_ctx_driver_t menu_ctx_null = {
+  NULL, // set_texture
+  NULL, // render_messagebox
+  NULL, // render
+  NULL, // frame
+  NULL, // init
+  NULL, // free
+  NULL, // context_reset
+  NULL, // context_destroy
+  NULL, // populate_entries
+  NULL, // toggle
+  NULL, // navigation_clear
+  NULL, // navigation_decrement
+  NULL, // navigation_increment
+  NULL, // navigation_set
+  NULL, // navigation_set_last
+  NULL, // navigation_descend_alphabet
+  NULL, // navigation_ascend_alphabet
+  NULL, // list_insert
+  NULL, // list_delete
+  NULL, // list_clear
+  NULL, // list_cache
+  NULL, // list_set_selection
+  NULL,
+  NULL,
+  "null",
+};

menu/menu_driver.c

@@ -41,6 +41,7 @@ static const menu_ctx_driver_t *menu_ctx_drivers[] = {
 #if defined(HAVE_RGUI)
    &menu_ctx_rgui,
 #endif
+   &menu_ctx_null,
    NULL
 };
 

menu/menu_driver.h

@@ -248,6 +248,7 @@ extern menu_ctx_driver_t menu_ctx_rgui;
 extern menu_ctx_driver_t menu_ctx_glui;
 extern menu_ctx_driver_t menu_ctx_xmb;
 extern menu_ctx_driver_t menu_ctx_ios;
+extern menu_ctx_driver_t menu_ctx_null;
 
 /**
  * menu_driver_find_handle: