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/release/default.nix

@@ -0,0 +1,120 @@
+{ lib, pkgs }:
+
+with pkgs;
+
+rec {
+
+  sourceTarball = args: import ./source-tarball.nix (
+    { inherit stdenv autoconf automake libtool;
+    } // args);
+
+  makeSourceTarball = sourceTarball; # compatibility
+
+  binaryTarball = args: import ./binary-tarball.nix (
+    { inherit stdenv;
+    } // args);
+
+  mvnBuild = args: import ./maven-build.nix (
+    { inherit stdenv;
+    } // args);
+
+  nixBuild = args: import ./nix-build.nix (
+    { inherit lib stdenv;
+    } // args);
+
+  coverageAnalysis = args: nixBuild (
+    { inherit lcov enableGCOVInstrumentation makeGCOVReport;
+      doCoverageAnalysis = true;
+    } // args);
+
+  clangAnalysis = args: nixBuild (
+    { inherit clang-analyzer;
+      doClangAnalysis = true;
+    } // args);
+
+  coverityAnalysis = args: nixBuild (
+    { inherit cov-build xz;
+      doCoverityAnalysis = true;
+    } // args);
+
+  rpmBuild = args: import ./rpm-build.nix (
+    { inherit vmTools;
+    } // args);
+
+  debBuild = args: import ./debian-build.nix (
+    { inherit lib stdenv vmTools checkinstall;
+    } // args);
+
+  aggregate =
+    { name, constituents, meta ? { } }:
+    pkgs.runCommand name
+      { inherit constituents meta;
+        preferLocalBuild = true;
+        _hydraAggregate = true;
+      }
+      ''
+        mkdir -p $out/nix-support
+        touch $out/nix-support/hydra-build-products
+        echo $constituents > $out/nix-support/hydra-aggregate-constituents
+
+        # Propagate build failures.
+        for i in $constituents; do
+          if [ -e $i/nix-support/failed ]; then
+            touch $out/nix-support/failed
+          fi
+        done
+      '';
+
+  /* Create a channel job which success depends on the success of all of
+     its contituents. Channel jobs are a special type of jobs that are
+     listed in the channel tab of Hydra and that can be suscribed.
+     A tarball of the src attribute is distributed via the channel.
+
+     - constituents: a list of derivations on which the channel success depends.
+     - name: the channel name that will be used in the hydra interface.
+     - src: should point to the root folder of the nix-expressions used by the
+            channel, typically a folder containing a `default.nix`.
+
+       channel {
+         constituents = [ foo bar baz ];
+         name = "my-channel";
+         src = ./.;
+       };
+
+  */
+  channel =
+    { name, src, constituents ? [], meta ? {}, isNixOS ? true, ... }@args:
+    stdenv.mkDerivation ({
+      preferLocalBuild = true;
+      _hydraAggregate = true;
+
+      phases = [ "unpackPhase" "patchPhase" "installPhase" ];
+
+      patchPhase = lib.optionalString isNixOS ''
+        touch .update-on-nixos-rebuild
+      '';
+
+      installPhase = ''
+        mkdir -p $out/{tarballs,nix-support}
+
+        tar cJf "$out/tarballs/nixexprs.tar.xz" \
+          --owner=0 --group=0 --mtime="1970-01-01 00:00:00 UTC" \
+          --transform='s!^\.!${name}!' .
+
+        echo "channel - $out/tarballs/nixexprs.tar.xz" > "$out/nix-support/hydra-build-products"
+        echo $constituents > "$out/nix-support/hydra-aggregate-constituents"
+
+        # Propagate build failures.
+        for i in $constituents; do
+          if [ -e "$i/nix-support/failed" ]; then
+            touch "$out/nix-support/failed"
+          fi
+        done
+      '';
+
+      meta = meta // {
+        isHydraChannel = true;
+      };
+    } // removeAttrs args [ "meta" ]);
+
+}