fix [#34900] Building blender as a python module is broken in trunk
patch provided by reporter - Martijn Berger (juicyfruit)

also quiet warnings for headless mode.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55895 954f8c5b-7b00-dc11-b283-0030488c597c