Blender Git Loki

Make fonts safe(r) for threading

Getting vfont data wasn't safe for threading, because it
was modifying font data which is in bmain and could be
shared by multiple objects.

For now made it so getting vfont uses critical section,
meaning vfont->data is initializing from inside a locked
mutex.

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svn merge -r58168:58169 ^/branches/soc-2013-depsgraph_mt