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/science/medicine/xmedcon/default.nix

@@ -0,0 +1,36 @@
+{ stdenv
+, lib
+, fetchurl
+, gtk3
+, glib
+, pkg-config
+, libpng
+, zlib
+}:
+
+stdenv.mkDerivation rec {
+  pname = "xmedcon";
+  version = "0.22.0";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/${pname}/${pname}-${version}.tar.bz2";
+    sha256 = "sha256-Ui7XoLSzTMPIFW/3nARCmvlGF+1l7pmcnKsnvn3NFJE=";
+  };
+
+  buildInputs = [
+    gtk3
+    glib
+    libpng
+    zlib
+  ];
+
+  nativeBuildInputs = [ pkg-config ];
+
+  meta = with lib; {
+    description = "An open source toolkit for medical image conversion ";
+    homepage = "https://xmedcon.sourceforge.io/Main/HomePage";
+    license = licenses.lgpl2Plus;
+    maintainers = with maintainers; [ arianvp flokli ];
+    platforms = platforms.darwin ++ platforms.linux;
+  };
+}