OSX: removing useless cocoa conditionals as it's solely api now

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@61133 954f8c5b-7b00-dc11-b283-0030488c597c
OSX/scons: remove obsolete cocoa conditionals from config

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@61134 954f8c5b-7b00-dc11-b283-0030488c597c