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-cache.nix

@@ -0,0 +1,33 @@
+{ runCommand, lib, fontconfig, fontDirectories }:
+
+runCommand "fc-cache"
+  {
+    nativeBuildInputs = [ fontconfig.bin ];
+    preferLocalBuild = true;
+    allowSubstitutes = false;
+    passAsFile = [ "fontDirs" ];
+    fontDirs = ''
+      <!-- Font directories -->
+      ${lib.concatStringsSep "\n" (map (font: "<dir>${font}</dir>") fontDirectories)}
+    '';
+  }
+  ''
+    export FONTCONFIG_FILE=$(pwd)/fonts.conf
+
+    cat > fonts.conf << EOF
+    <?xml version='1.0'?>
+    <!DOCTYPE fontconfig SYSTEM 'urn:fontconfig:fonts.dtd'>
+    <fontconfig>
+      <include>${fontconfig.out}/etc/fonts/fonts.conf</include>
+      <cachedir>$out</cachedir>
+    EOF
+    cat "$fontDirsPath" >> fonts.conf
+    echo "</fontconfig>" >> fonts.conf
+
+    mkdir -p $out
+    fc-cache -sv
+
+    # This is not a cache dir in the normal sense -- it won't be automatically
+    # recreated.
+    rm -f "$out/CACHEDIR.TAG"
+  ''