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/tools/build-managers/bmake/unconditional-ksh-test.patch

@@ -0,0 +1,12 @@
+--- bmake/unit-tests/Makefile.orig	2021-07-04 19:13:09.068094922 +0200
++++ bmake/unit-tests/Makefile	2021-07-04 19:13:14.630080696 +0200
+@@ -295,9 +295,7 @@
+ TESTS+=		sh-single-line
+ TESTS+=		shell-csh
+ TESTS+=		shell-custom
+-.if exists(/bin/ksh)
+ TESTS+=		shell-ksh
+-.endif
+ TESTS+=		shell-sh
+ TESTS+=		suff-add-later
+ TESTS+=		suff-clear-regular