Use cmake in libobjc2 build process.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/tools/scripts/trunk@36719 72102866-910b-0410-8b05-ffd578937521
Revert changes to compile-all script.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/tools/scripts/trunk@36760 72102866-910b-0410-8b05-ffd578937521