Make sure we always release buffers
Make sure we always release buffers

If for some reason the compositor is not able to handle a buffer
before the next one arrives, the buffer would be locked forever.
This change detects that case, and adds an "emergency release", and
displays a warning.

locusf/qtwayland-1,locusf/qtwayland-1,locusf/qtwayland-1,ntanibata/qtwayland,Tofee/qtwayland,ntanibata/qtwayland,ntanibata/qtwayland,Tofee/qtwayland,locusf/qtwayland-1,Tofee/qtwayland