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/interpreters/ruby/rubygems/0001-add-post-extract-hook.patch

@@ -0,0 +1,34 @@
+From a6485cfcdf51ff8be452980f93cebfea97f34dec Mon Sep 17 00:00:00 2001
+From: zimbatm <zimbatm@zimbatm.com>
+Date: Wed, 21 Sep 2016 09:32:34 +0100
+Subject: [PATCH 1/3] add post-extract hook
+
+Allows nix to execute scripts just after the gem extraction
+---
+ lib/rubygems/installer.rb | 10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/lib/rubygems/installer.rb b/lib/rubygems/installer.rb
+index d26b1e88..bf18fb7f 100644
+--- a/lib/rubygems/installer.rb
++++ b/lib/rubygems/installer.rb
+@@ -848,7 +848,15 @@ TEXT
+   # Ensures that files can't be installed outside the gem directory.
+ 
+   def extract_files
+-    @package.extract_files gem_dir
++    ret = @package.extract_files gem_dir
++    if ENV['NIX_POST_EXTRACT_FILES_HOOK']
++      puts
++      puts "running NIX_POST_EXTRACT_FILES_HOOK #{ENV['NIX_POST_EXTRACT_FILES_HOOK']} #{gem_dir}"
++      system(ENV['NIX_POST_EXTRACT_FILES_HOOK'], gem_dir.to_s)
++      puts "running NIX_POST_EXTRACT_FILES_HOOK done"
++      puts
++    end
++    ret
+   end
+ 
+   ##
+-- 
+2.21.0
+