Blender Git Loki

Partial revert of rev58110

There's one thing we didn't foresee from the beginning,
which is apparently TLS is only available in OSX starting
from version 10.7, and we still do support of 10.6.

After recent Brecht's changes about locked viewport
while initializing BI render this TLS is not needed
in trunk anymore. So reverting this chunk of base
iteration to use static variable. But leaving all the
other static variables warped into context still, it
should help a bit in the future refactor.

Real fix would be to have some kind of graph context
evaluation structure which would be passing to update
routines (which will solve threaded mballs update) and
making depsgraph responsible for getting a motherball.
But this is all for GSoC project.