Code cleanuo:
* Remove already commented "use_radiosity" flag from RNA. 
* Remove some commented exceptions for old 2.4x 3D View preview region. 
* Remove empty and commented function declarations from 2.4x UI times

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55532 954f8c5b-7b00-dc11-b283-0030488c597c