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/skaware/build-skaware-package.nix

@@ -0,0 +1,117 @@
+{ lib, stdenv, cleanPackaging, fetchurl }:
+{
+  # : string
+  pname
+  # : string
+, version
+  # : string
+, sha256
+  # : string
+, description
+  # : list Platform
+, platforms ? lib.platforms.all
+  # : list string
+, outputs ? [ "bin" "lib" "dev" "doc" "out" ]
+  # TODO(Profpatsch): automatically infer most of these
+  # : list string
+, configureFlags
+  # : string
+, postConfigure ? null
+  # mostly for moving and deleting files from the build directory
+  # : lines
+, postInstall
+  # : list Maintainer
+, maintainers ? [ ]
+  # : passthru arguments (e.g. tests)
+, passthru ? { }
+
+}:
+
+let
+
+  # File globs that can always be deleted
+  commonNoiseFiles = [
+    ".gitignore"
+    "Makefile"
+    "INSTALL"
+    "configure"
+    "patch-for-solaris"
+    "src/**/*"
+    "tools/**/*"
+    "package/**/*"
+    "config.mak"
+  ];
+
+  # File globs that should be moved to $doc
+  commonMetaFiles = [
+    "COPYING"
+    "AUTHORS"
+    "NEWS"
+    "CHANGELOG"
+    "README"
+    "README.*"
+    "DCO"
+    "CONTRIBUTING"
+  ];
+
+in
+stdenv.mkDerivation {
+  inherit pname version;
+
+  src = fetchurl {
+    url = "https://skarnet.org/software/${pname}/${pname}-${version}.tar.gz";
+    inherit sha256;
+  };
+
+  inherit outputs;
+
+  dontDisableStatic = true;
+  enableParallelBuilding = true;
+
+  configureFlags = configureFlags ++ [
+    "--enable-absolute-paths"
+    # We assume every nix-based cross target has urandom.
+    # This might not hold for e.g. BSD.
+    "--with-sysdep-devurandom=yes"
+    (if stdenv.isDarwin
+    then "--disable-shared"
+    else "--enable-shared")
+  ]
+    # On darwin, the target triplet from -dumpmachine includes version number,
+    # but skarnet.org software uses the triplet to test binary compatibility.
+    # Explicitly setting target ensures code can be compiled against a skalibs
+    # binary built on a different version of darwin.
+    # http://www.skarnet.org/cgi-bin/archive.cgi?1:mss:623:heiodchokfjdkonfhdph
+    ++ (lib.optional stdenv.isDarwin
+    "--build=${stdenv.hostPlatform.system}");
+
+  inherit postConfigure;
+
+  makeFlags = lib.optional stdenv.cc.isClang [ "AR=${stdenv.cc.targetPrefix}ar" "RANLIB=${stdenv.cc.targetPrefix}ranlib" ];
+
+  # TODO(Profpatsch): ensure that there is always a $doc output!
+  postInstall = ''
+    echo "Cleaning & moving common files"
+    ${cleanPackaging.commonFileActions {
+       noiseFiles = commonNoiseFiles;
+       docFiles = commonMetaFiles;
+     }} $doc/share/doc/${pname}
+
+    ${postInstall}
+  '';
+
+  postFixup = ''
+    ${cleanPackaging.checkForRemainingFiles}
+  '';
+
+  meta = {
+    homepage = "https://skarnet.org/software/${pname}/";
+    inherit description platforms;
+    license = lib.licenses.isc;
+    maintainers = with lib.maintainers;
+      [ pmahoney Profpatsch qyliss ] ++ maintainers;
+  };
+
+  inherit passthru;
+
+}