WORKAROUND for nvidia VBO failures

When switching virtual terminals,
suspending to ram and resizing the
screen (GL viewport) at least the
nvidia driver moves VBO data between
the video RAM and the system heap -
and something about this isn't reliable:

An often perceived resulted are scattered
windows but it may also be the cause for
entirely black screens reported for same
occasions.

As a workaround, we hook into the GL debug
messages and filter them for the suspicious
message, then re-init VBOs

TODO:
figure whether that's our fault or nvidias

REVIEW: 123936
CCBUG: 344326

Patch applies to KWin 5.4