include GNUstep for enhanced old Mac compatibility

git-svn-id: svn+ssh://svn.savannah.nongnu.org/gap/trunk@2784 d25b4930-3292-e311-b074-0010c6de5da8
rename arguments to fix loval variable hiding warning

git-svn-id: svn+ssh://svn.savannah.nongnu.org/gap/trunk@2785 d25b4930-3292-e311-b074-0010c6de5da8