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/tools/graphics/jhead/default.nix

@@ -0,0 +1,36 @@
+{ lib, stdenv, fetchFromGitHub, libjpeg }:
+
+stdenv.mkDerivation rec {
+  pname = "jhead";
+  version = "3.06.0.1";
+
+  src = fetchFromGitHub {
+    owner = "Matthias-Wandel";
+    repo = "jhead";
+    rev = version;
+    sha256 = "0zgh36486cpcnf7xg6dwf7rhz2h4gpayqvdk8hmrx6y418b2pfyf";
+  };
+
+  buildInputs = [ libjpeg ];
+
+  makeFlags = [ "CPPFLAGS=" "CFLAGS=-O3" "LDFLAGS=" ];
+
+  installPhase = ''
+    mkdir -p \
+      $out/bin \
+      $out/man/man1 \
+      $out/share/doc/${pname}-${version}
+
+    cp -v jhead $out/bin
+    cp -v jhead.1 $out/man/man1
+    cp -v *.txt $out/share/doc/${pname}-${version}
+  '';
+
+  meta = with lib; {
+    homepage = "http://www.sentex.net/~mwandel/jhead/";
+    description = "Exif Jpeg header manipulation tool";
+    license = licenses.publicDomain;
+    maintainers = with maintainers; [ rycee ];
+    platforms = platforms.all;
+  };
+}