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/tools/misc/you-get/ffmpeg-path.patch

@@ -0,0 +1,13 @@
+diff --git a/src/you_get/processor/ffmpeg.py b/src/you_get/processor/ffmpeg.py
+index 50e2c9f..46e7f61 100755
+--- a/src/you_get/processor/ffmpeg.py
++++ b/src/you_get/processor/ffmpeg.py
+@@ -31,7 +31,7 @@ def get_usable_ffmpeg(cmd):
+     except:
+         return None
+ 
+-FFMPEG, FFPROBE, FFMPEG_VERSION = get_usable_ffmpeg('ffmpeg') or get_usable_ffmpeg('avconv') or (None, None, None)
++FFMPEG, FFPROBE, FFMPEG_VERSION = ('@ffmpeg@', '@ffprobe@', '@version@')
+ if logging.getLogger().isEnabledFor(logging.DEBUG):
+     LOGLEVEL = ['-loglevel', 'info']
+     STDIN = None