[Bf-committers] MinGW-w64 pthread update

[Antony Riakiotakis]

Hi,

There has been a multitude of fixes to the pthread library of MinGW-w64
recently.

All knowns cases for trouble:

* Openmp related - includes hangs on rendering with multithread/subsurf and
physics baking,
* Crashes on painting
* Crashes on depsgraph update

All seem to function correctly now. Of course there may still be cases I am
not aware of but the builds should be much safer to use now :)