media-gfx/blender: version bump to 2.72
media-gfx/blender: rm old
media-gfx/blender: re-add 2.71 and fix Manifest wrt #523328

Since 2.72 seems to be a release candidate and 2.71 is
considered stable by upstream.
media-gfx/blender: unbundle minilzo wrt #515266

This fixes the security bug in blender, since the system version
of lzo already contains the fix:
https://bugs.gentoo.org/show_bug.cgi?id=515266
http://seclists.org/oss-sec/2014/q2/665
https://developer.blender.org/T41974

2.71-r2 wasn't propagated yet, so no revbump needed.