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/build-support/fetchmavenartifact/default.nix

@@ -0,0 +1,76 @@
+# Adaptation of the MIT-licensed work on `sbt2nix` done by Charles O'Farrell
+
+{ lib, fetchurl, stdenv }:
+let
+  defaultRepos = [
+    "https://repo1.maven.org/maven2"
+    "https://oss.sonatype.org/content/repositories/releases"
+    "https://oss.sonatype.org/content/repositories/public"
+    "https://repo.typesafe.com/typesafe/releases"
+  ];
+in
+
+args@
+{ # Example: "org.apache.httpcomponents"
+  groupId
+, # Example: "httpclient"
+  artifactId
+, # Example: "4.3.6"
+  version
+, # Example: "jdk11"
+  classifier ? null
+, # List of maven repositories from where to fetch the artifact.
+  # Example: [ http://oss.sonatype.org/content/repositories/public ].
+  repos ? defaultRepos
+  # The `url` and `urls` parameters, if specified should point to the JAR
+  # file and will take precedence over the `repos` parameter. Only one of `url`
+  # and `urls` can be specified, not both.
+, url ? ""
+, urls ? []
+, # The rest of the arguments are just forwarded to `fetchurl`.
+  ...
+}:
+
+# only one of url and urls can be specified at a time.
+assert (url == "") || (urls == []);
+# if repos is empty, then url or urls must be specified.
+assert (repos != []) || (url != "") || (urls != []);
+
+let
+  name_ =
+    lib.concatStrings [
+      (lib.replaceChars ["."] ["_"] groupId) "_"
+      (lib.replaceChars ["."] ["_"] artifactId) "-"
+      version
+    ];
+  mkJarUrl = repoUrl:
+    lib.concatStringsSep "/" [
+      (lib.removeSuffix "/" repoUrl)
+      (lib.replaceChars ["."] ["/"] groupId)
+      artifactId
+      version
+      "${artifactId}-${version}${lib.optionalString (!isNull classifier) "-${classifier}"}.jar"
+    ];
+  urls_ =
+    if url != "" then [url]
+    else if urls != [] then urls
+    else map mkJarUrl repos;
+  jar =
+    fetchurl (
+      builtins.removeAttrs args ["groupId" "artifactId" "version" "classifier" "repos" "url" ]
+        // { urls = urls_; name = "${name_}.jar"; }
+    );
+in
+  stdenv.mkDerivation {
+    name = name_;
+    phases = "installPhase fixupPhase";
+    # By moving the jar to $out/share/java we make it discoverable by java
+    # packages packages that mention this derivation in their buildInputs.
+    installPhase = ''
+      mkdir -p $out/share/java
+      ln -s ${jar} $out/share/java/${artifactId}-${version}.jar
+    '';
+    # We also add a `jar` attribute that can be used to easily obtain the path
+    # to the downloaded jar file.
+    passthru.jar = jar;
+  }