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/version-management/vcprompt/default.nix

@@ -0,0 +1,30 @@
+{ lib, stdenv, fetchhg, autoconf, sqlite }:
+
+stdenv.mkDerivation rec {
+  pname = "vcprompt";
+  version = "1.2.1";
+
+  src = fetchhg {
+    url = "http://hg.gerg.ca/vcprompt/";
+    rev = version;
+    sha256 = "03xqvp6bfl98bpacrw4n82qv9cw6a4fxci802s3vrygas989v1kj";
+  };
+
+  buildInputs = [ sqlite autoconf ];
+
+  preConfigure = ''
+    autoconf
+    makeFlags="$makeFlags PREFIX=$out"
+  '';
+
+  meta = with lib; {
+    description = ''
+      A little C program that prints a short string with barebones information
+      about the current working directory for various version control systems
+    '';
+    homepage    = "http://hg.gerg.ca/vcprompt";
+    maintainers = with maintainers; [ cstrahan ];
+    platforms   = with platforms; linux ++ darwin;
+    license = licenses.gpl2Plus;
+  };
+}