Removed the deprecated _CM24 CMake variables

These were introduced for CMake 2.4 installation paths, and were
deprecated in favor of VTK_INSTALL_*_DIR variables. Ported existing code
to use these variables, removed the old declarations and removed some
unused CMake code in Utilities/Release instead of porting it forward.

Change-Id: I67ba95016eeb8536ebda8b8e44b30c9f2177744e
Merge topic 'remove-CM24-vars' into master

2f5fdb13 Removed the deprecated _CM24 CMake variables