winemac.drv: Actually make the GL context current even if no drawables were given.
The spec for GL_ARB_framebuffer_object (and thus, OpenGL 3.x and up) is quite clear on what happens when a context is made current with no drawable(s). In fact, the WGL_ARB_create_context extension amends WGL_ARB_make_current_read (as well as the base spec for wglMakeCurrent) specifically to allow this. Signed-off-by: Charles Davis <cdavis5x@gmail.com> Signed-off-by: Ken Thomases <ken@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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