Add instructions for pluging in another compiler into Xcode.
Add instructions for pluging in another compiler into Xcode.


git-svn-id: http://squeakvm.org/svn/squeak/branches/Cog@3504 fa1542d4-bde8-0310-ad64-8ed1123d492a

Former-commit-id: 95f0b00529502d1b047cb9db7b9ac3ec2f98ff35
peteruhnak/pharo-vm,timfel/squeakvm,peteruhnak/pharo-vm,timfel/squeakvm,bencoman/pharo-vm,peteruhnak/pharo-vm,OpenSmalltalk/vm,OpenSmalltalk/vm,peteruhnak/pharo-vm,bencoman/pharo-vm,bencoman/pharo-vm,timfel/squeakvm,timfel/squeakvm,peteruhnak/pharo-vm,timfel/squeakvm,OpenSmalltalk/vm,bencoman/pharo-vm,peteruhnak/pharo-vm,bencoman/pharo-vm,OpenSmalltalk/vm,bencoman/pharo-vm,timfel/squeakvm,bencoman/pharo-vm,bencoman/pharo-vm,bencoman/pharo-vm,OpenSmalltalk/vm,OpenSmalltalk/vm,peteruhnak/pharo-vm,OpenSmalltalk/vm,peteruhnak/pharo-vm,timfel/squeakvm,OpenSmalltalk/vm,timfel/squeakvm