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/shells/fish/plugins/foreign-env/suppress-harmless-warnings.patch

@@ -0,0 +1,23 @@
+diff --git a/functions/fenv.apply.fish b/functions/fenv.apply.fish
+index 34a25e3..3d94135 100644
+--- a/functions/fenv.apply.fish
++++ b/functions/fenv.apply.fish
+@@ -27,11 +27,17 @@ function fenv.apply
+     for variable in $variables
+         set key (echo $variable | sed 's/=.*//')
+         set value (echo $variable | sed 's/[^=]*=//')
++        set ignore PATH _
+ 
+         if test "$key" = 'PATH'
+           set value (echo $value | tr ':' '\n')
+         end
+ 
+-        set -g -x $key $value
++        if contains $key $ignore
++          set -g -x $key $value 2>/dev/null
++        else
++          set -g -x $key $value
++        end
++
+     end
+ end