Update mac mini 2 release to use bzip2 compression.
Merge topic 'build_cmake_dmg_with_bzip' into next

6b25938c Update mac mini 2 release to use bzip2 compression.
CMake now using bzip2 compression for mac release bundles.

Starting with OSX 10.4 dmg files offers bzip2 compression which offers
small package sizes.
Merge topic 'build_cmake_dmg_with_bzip' into next

ffa5db96 CMake now using bzip2 compression for mac release bundles.