user32: Track the number of GL surfaces for a window rather than the pixel format.

[Ken Thomases]

The specific pixel format was never used.  It was effectively just a flag
indicating if the window had a GL surface.  This generalizes it from a flag
to a count, to allow for multiple GL surfaces.

This supports the future WGL_WINE_surface extension.
---
dlls/opengl32/make_opengl | 2 +-
dlls/user32/user32.spec   | 2 +-
dlls/user32/win.c         | 8 ++++----
dlls/user32/win.h         | 2 +-
dlls/user32/winpos.c      | 2 +-
dlls/winemac.drv/opengl.c | 8 +++++---
dlls/winex11.drv/opengl.c | 6 ++++--
7 files changed, 17 insertions(+), 13 deletions(-)

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