Fix implicit declaration in RetroArch Nintendo Switch build

.github/workflows/autobuild.yml

@@ -1100,8 +1100,16 @@ jobs:
 
       - name: Build RetroArch
         run: |
+          cp retro/retroarch-1.20.0-libnx.patch ~
           cd ~
-          git clone https://github.com/libretro/RetroArch retroarch --depth 1 -b $(curl -s https://api.github.com/repos/libretro/RetroArch/releases/latest | jq -r '.tag_name')
+          tag_name=$(curl -s https://api.github.com/repos/libretro/RetroArch/releases/latest | jq -r '.tag_name')
+          git clone https://github.com/libretro/RetroArch retroarch --depth 1 -b $tag_name
+          if [ $tag_name = 'v1.20.0' ]
+          then
+            cd retroarch
+            git apply ~/retroarch-1.20.0-libnx.patch
+            cd ..
+          fi
           mv mkxp-z_libretro.a retroarch/libretro_libnx.a
           cd retroarch
           CLICOLOR_FORCE=1 make -f Makefile.libnx LIBRETRO=mkxp-z

retro/retroarch-1.20.0-libnx.patch

@@ -0,0 +1,11 @@
+--- a/menu/menu_driver.c
++++ b/menu/menu_driver.c
+@@ -5126,7 +5126,7 @@ bool menu_input_dialog_get_display_kb(void)
+ 
+    if (typing)
+       return false;
+-
++   void libnx_apply_overclock(void);
+    /* swkbd only works on "real" titles */
+    if (     __nx_applet_type != AppletType_Application
+          && __nx_applet_type != AppletType_SystemApplication)