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/misc/ghostscript/test-corpus-render.nix

@@ -0,0 +1,37 @@
+{ stdenv
+, fetchgit
+, ghostscript
+}:
+
+stdenv.mkDerivation {
+  pname = "ghostscript-test-corpus-render";
+  version = "unstable-2020-02-19";
+
+  src = fetchgit {
+    url = "git://git.ghostscript.com/tests.git";
+    rev = "efdd224340d9a407ed3ec22afa1cb127c8fee73c";
+    sha256 = "1v1iqz897zzrwa8ng22zcf3y61ab5798jdwidgv10w1r9mjrl7ax";
+  };
+
+  dontConfigure = true;
+  dontBuild = true;
+
+  doCheck = true;
+  checkPhase = ''
+    find . -iregex '.*\.\(ps\|eps\|pdf\)' | while read f; do
+      echo "Rendering $f"
+      ${ghostscript}/bin/gs \
+        -dNOPAUSE \
+        -dBATCH \
+        -sDEVICE=bitcmyk \
+        -sOutputFile=/dev/null \
+        -r600 \
+        -dBufferSpace=100000 \
+        $f
+    done
+  '';
+
+  installPhase = ''
+    touch $out
+  '';
+}