Universal 'dyld' command for multilib builds, cmake deps checking etc.
Add a partial implementation of the Apple System Log facility.
Add auto_assign_weak_reference stub.
Move a message to LOG.
Add a default exception preprocessor (though it is not called yet.)
NSCFString is in gnustep-corebase and doesn't need to be here anymore (it wasn't compiled in anyway.)
Merge remote-tracking branch 'upstream/master'