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/kde/kdenlive/mlt-path.patch

@@ -0,0 +1,22 @@
+diff -ruN old/src/kdenlivesettings.kcfg new/src/kdenlivesettings.kcfg
+--- old/src/kdenlivesettings.kcfg	2019-09-10 23:20:27.555392353 -0400
++++ new/src/kdenlivesettings.kcfg	2019-09-10 23:25:47.533964155 -0400
+@@ -378,14 +378,14 @@
+ </group>
+ 
+   <group name="env">
+-    <entry name="mltpath" type="Path">
++    <entry name="mltpath" type="Path" hidden="true">
+       <label>Mlt framework install path.</label>
+-      <default></default>
++      <default>@mlt@/share/mlt/profiles</default>
+     </entry>
+ 
+-    <entry name="rendererpath" type="Path">
++    <entry name="rendererpath" type="Path" hidden="true">
+       <label>Mlt melt renderer install path.</label>
+-      <default></default>
++      <default>@mlt@/bin/melt</default>
+     </entry>
+ 
+     <entry name="ffmpegpath" type="Path">