uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/applications/emulators/retroarch/fix-config.patch

@@ -0,0 +1,26 @@
+diff --git a/retroarch.cfg b/retroarch.cfg
+index cdcb199c9f..08b9b1cf10 100644
+--- a/retroarch.cfg
++++ b/retroarch.cfg
+@@ -681,7 +681,7 @@
+ # menu_show_online_updater = true
+ 
+ # If disabled, will hide the ability to update cores (and core info files) inside the menu.
+-# menu_show_core_updater = true
++menu_show_core_updater = false
+ 
+ # If disabled, the libretro core will keep running in the background when we
+ # are in the menu.
+@@ -823,10 +823,10 @@
+ # rgui_browser_directory =
+ 
+ # Core directory for libretro core implementations.
+-# libretro_directory =
++libretro_directory = @libretro_directory@
+ 
+ # Core info directory for libretro core information.
+-# libretro_info_path =
++libretro_info_path = @libretro_info_path@
+ 
+ # Path to content database directory.
+ # content_database_path =