Some cleanup/reorganisation, and:
* Script should now remove relevant dirs in $INST when a package becomes suitable
* Script systematically runs relevant ldconfig commands when building boost/oiio

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@57020 954f8c5b-7b00-dc11-b283-0030488c597c