winemac: Don't override -[NSOpenGLContext clearDrawable], just use our own method.

[Ken Thomases]

-clearDrawable is called by the framework at times, including in -dealloc,
and we don't want to change its behavior in those cases.  In particular, I
saw crashes in Peggle Deluxe due to that.
---
dlls/winemac.drv/cocoa_opengl.m |    8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)

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