Blender Git Loki

BGE: Fix T46381 : last action frame not updated.

It fix T46381. Normally BL_Action::Update (manage action time, end, loop?) should be called the same number of times as BL_Action::UpdateIPO (update action position, scale ect? in the game object).
But the bug report shows that UpdateIPO is called one less time than Update. To fix it i revert the commit 362b25b38287cb75e4d22b30bdbc7f47e8eb3fdf and implement a mutex in BL_Action::Update.
Example file : {F245823}

Reviewers: lordloki, kupoman, campbellbarton, youle, moguri, sybren

Reviewed By: youle, moguri, sybren

Maniphest Tasks: T39928, T46381

Differential Revision: https://developer.blender.org/D1562