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/nim-packages/snappy/config.patch

@@ -0,0 +1,7 @@
+diff --git a/tests/config.nims b/tests/config.nims
+index 46348f1..fbe9f5e 100644
+--- a/tests/config.nims
++++ b/tests/config.nims
+@@ -1 +1,2 @@
+ switch("path", "..")
++switch("passL", "-lsnappy")