[aur-general] Big merge/remove request

[Xorg]

Hi.

This request concerns AUR package darling-git. When this package was 
written for first time, his dependencies (an AUR group called 
gnustep-clang-git) were on Git. But today, these dependencies use SVN, 
so we use group gnustep-clang-svn instead of gnustep-clang-git. 
gnustep-clang-git is useless alone, and a bit obsolete.

Please merge :
- gnustep-base-clang-git in gnustep-base-clang-svn
- gnustep-corebase-clang-git in gnustep-corebase-clang-svn
- gnustep-gui-clang-git in gnustep-gui-clang-svn
- gnustep-libobjc2-clang-git in gnustep-libobjc2-clang-svn
- gnustep-make-clang-git in gnustep-make-clang-svn

And please remove :
- gnustep-opal-clang-git
Because we don't use it anyway («Skip Opal, as it is not working anyway» 
: http://darling.dolezel.info/en/Build/Ubuntu#GNUstep_Opal), so there 
will not be a gnustep-opal-clang-svn package.

Thanks a lot in advance.