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/misc/chruby/env.patch

@@ -0,0 +1,12 @@
+diff --git a/share/chruby/chruby.sh b/share/chruby/chruby.sh
+--- a/share/chruby/chruby.sh
++++ b/share/chruby/chruby.sh
+@@ -1,7 +1,7 @@
+ CHRUBY_VERSION="0.3.8"
+ RUBIES=()
+ 
+-for dir in "$PREFIX/opt/rubies" "$HOME/.rubies"; do
++for dir in @rubiesEnv@; do
+ 	[[ -d "$dir" && -n "$(ls -A "$dir")" ]] && RUBIES+=("$dir"/*)
+ done
+ unset dir