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/applications/search/grepm/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchurl, perlPackages, mutt }:
+
+stdenv.mkDerivation {
+  pname = "grepm";
+  version = "0.6";
+
+  src = fetchurl {
+    url = "http://www.barsnick.net/sw/grepm";
+    sha256 = "0ppprhfw06779hz1b10qvq62gsw73shccsav982dyi6xmqb6jqji";
+  };
+
+  dontUnpack = true;
+
+  buildInputs = [ perlPackages.grepmail mutt ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp -a $src $out/bin/grepm
+    chmod +x $out/bin/grepm
+    sed -i \
+      -e "s:^grepmail:${perlPackages.grepmail}/bin/grepmail:" \
+      -e "s:^\( *\)mutt:\1${mutt}/bin/mutt:" \
+      $out/bin/grepm
+  '';
+
+  meta = with lib; {
+    description = "Wrapper for grepmail utilizing mutt";
+    homepage = "http://www.barsnick.net/sw/grepm.html";
+    license = licenses.free;
+    platforms = platforms.unix;
+    maintainers = [ maintainers.romildo ];
+  };
+}