Main change is that VST GUI support is now integrate with new Cocoa
views. Direct support for VST Cocoa views (via Cockos extensions:
http://www.reaper.fm/sdk/vst/vst_ext.php) has been added.
This provides additional improvements and updates for building
Audacity using Xcode 5.1 or above.
The whole configure/makefile system is no longer used during
normal builds. During library additions/updates it used to
regenerated the headers in mac/config.