OSX/scons: some cleanups

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@61192 954f8c5b-7b00-dc11-b283-0030488c597c
Tweak for ui range of track size in 3d viewport

Patch by Sebastian Koenig, thanks!

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@61193 954f8c5b-7b00-dc11-b283-0030488c597c