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/desktops/arcan/wrapper.nix

@@ -0,0 +1,29 @@
+{ arcan
+, makeWrapper
+, symlinkJoin
+, appls ? [ ]
+, name ? "arcan-wrapped"
+}:
+
+symlinkJoin rec {
+  inherit name;
+
+  paths = appls ++ [ arcan ];
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  postBuild = ''
+    for prog in ${placeholder "out"}/bin/*; do
+      wrapProgram $prog \
+        --prefix PATH ":" "${placeholder "out"}/bin" \
+        --set ARCAN_APPLBASEPATH "${placeholder "out"}/share/arcan/appl/" \
+        --set ARCAN_BINPATH "${placeholder "out"}/bin/arcan_frameserver" \
+        --set ARCAN_LIBPATH "${placeholder "out"}/lib/" \
+        --set ARCAN_RESOURCEPATH "${placeholder "out"}/share/arcan/resources/" \
+        --set ARCAN_SCRIPTPATH "${placeholder "out"}/share/arcan/scripts/"
+    done
+  '';
+}
+# TODO: set ARCAN_STATEBASEPATH to $HOME/.arcan/resources/savestates/ - possibly
+# via a suitable script
+# TODO: set ARCAN_FONTPATH to a set of default-but-configurable fontset