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/misc/ptask/tw-version.patch

@@ -0,0 +1,11 @@
+--- a/src/tw.c	2017-02-21 22:56:19.289037608 +0100
++++ b/src/tw.c	2017-02-21 22:57:04.726814256 +0100
+@@ -116,7 +116,7 @@
+ 	    || !strcmp(ver, "2.3.0")
+ 	    || !strcmp(ver, "2.4.0")
+ 	    || !strcmp(ver, "2.4.1")
+-	    || !strcmp(ver, "2.5.0"))
++	    || !strcmp(ver, "2.5.1"))
+ 		return 1;
+ 	else
+ 		return 0;