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/version-management/git-and-tools/git-subrepo/zsh-completion.patch

@@ -0,0 +1,32 @@
+diff --git a/pkg/bin/generate-completion.pl b/pkg/bin/generate-completion.pl
+index 85ae3b8..d3e423c 100644
+--- a/pkg/bin/generate-completion.pl
++++ b/pkg/bin/generate-completion.pl
+@@ -82,11 +82,6 @@ sub generate_zsh {
+ 
+ # DO NOT EDIT. This file generated by pkg/bin/generate-completion.pl.
+ 
+-if [[ -z $GIT_SUBREPO_ROOT ]]; then
+-	echo 'GIT_SUBREPO_ROOT is null; has `/path/to/git-subrepo/.rc` been sourced?'
+-	return 3
+-fi
+-
+ _git-subrepo() {
+     typeset -A opt_args
+     local curcontext="$curcontext" state line context
+diff --git a/share/zsh-completion/_git-subrepo b/share/zsh-completion/_git-subrepo
+index fc82be2..a8069d9 100644
+--- a/share/zsh-completion/_git-subrepo
++++ b/share/zsh-completion/_git-subrepo
+@@ -3,11 +3,6 @@
+ 
+ # DO NOT EDIT. This file generated by pkg/bin/generate-completion.pl.
+ 
+-if [[ -z $GIT_SUBREPO_ROOT ]]; then
+-	echo 'GIT_SUBREPO_ROOT is null; has `/path/to/git-subrepo/.rc` been sourced?'
+-	return 3
+-fi
+-
+ _git-subrepo() {
+     typeset -A opt_args
+     local curcontext="$curcontext" state line context