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/development/libraries/fontconfig/make-fonts-conf.nix

@@ -0,0 +1,15 @@
+{ runCommand, libxslt, fontconfig, dejavu_fonts, fontDirectories }:
+
+runCommand "fonts.conf"
+  {
+    nativeBuildInputs = [ libxslt ];
+    buildInputs = [ fontconfig ];
+    # Add a default font for non-nixos systems, <1MB and in nixos defaults.
+    fontDirectories = fontDirectories ++ [ dejavu_fonts.minimal ];
+  }
+  ''
+    xsltproc --stringparam fontDirectories "$fontDirectories" \
+      --path ${fontconfig.out}/share/xml/fontconfig \
+      ${./make-fonts-conf.xsl} ${fontconfig.out}/etc/fonts/fonts.conf \
+      > $out
+  ''