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/development/mobile/androidenv/build-app.nix

@@ -0,0 +1,48 @@
+{ composeAndroidPackages, stdenv, lib, ant, jdk, gnumake, gawk }:
+
+{ name
+, release ? false, keyStore ? null, keyAlias ? null, keyStorePassword ? null, keyAliasPassword ? null
+, antFlags ? ""
+, ...
+}@args:
+
+assert release -> keyStore != null && keyAlias != null && keyStorePassword != null && keyAliasPassword != null;
+
+let
+  androidSdkFormalArgs = builtins.functionArgs composeAndroidPackages;
+  androidArgs = builtins.intersectAttrs androidSdkFormalArgs args;
+  androidsdk = (composeAndroidPackages androidArgs).androidsdk;
+
+  extraArgs = removeAttrs args ([ "name" ] ++ builtins.attrNames androidSdkFormalArgs);
+in
+stdenv.mkDerivation ({
+  name = lib.replaceChars [" "] [""] name; # Android APKs may contain white spaces in their names, but Nix store paths cannot
+  ANDROID_HOME = "${androidsdk}/libexec/android-sdk";
+  buildInputs = [ jdk ant ];
+  buildPhase = ''
+    ${lib.optionalString release ''
+      # Provide key singing attributes
+      ( echo "key.store=${keyStore}"
+        echo "key.alias=${keyAlias}"
+        echo "key.store.password=${keyStorePassword}"
+        echo "key.alias.password=${keyAliasPassword}"
+      ) >> ant.properties
+    ''}
+
+    export ANDROID_SDK_HOME=`pwd` # Key files cannot be stored in the user's home directory. This overrides it.
+
+    ${lib.optionalString (args ? includeNDK && args.includeNDK) ''
+      export GNUMAKE=${gnumake}/bin/make
+      export NDK_HOST_AWK=${gawk}/bin/gawk
+      ${androidsdk}/libexec/android-sdk/ndk-bundle/ndk-build
+    ''}
+    ant ${antFlags} ${if release then "release" else "debug"}
+  '';
+  installPhase = ''
+    mkdir -p $out
+    mv bin/*-${if release then "release" else "debug"}.apk $out
+
+    mkdir -p $out/nix-support
+    echo "file binary-dist \"$(echo $out/*.apk)\"" > $out/nix-support/hydra-build-products
+  '';
+} // extraArgs)