wined3d: Don't clear the GL context such that it can't be restored.

[Ken Thomases]

The original author of the code being removed, Matteo Bruni, gives his blessing
to removing it.  If the driver bugs mentioned in the comment resurface, we can
look into working around them in a different way that doesn't break other
stuff (and documents the problems more clearly).

Fixes <https://bugs.winehq.org/show_bug.cgi?id=28869>.
---
dlls/wined3d/device.c |    3 ---
1 files changed, 0 insertions(+), 3 deletions(-)

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