wddm: ensure all windows are initially hidden
crOpenGL: fix lib dep issue
wddm/crOpenGL: some bugfixes, more TexPresent fixes
No description statement in .def files, linker complains.
crOpenGL: correct VBoxOGL exports defs
crOpenGL/wddm: basics for miniport-based visible rects processing (guest part); export flushToHost command
crOgl/wddm: per-context connections
crOpenGL: add WGL_EXT_pixel_format and WGL_ARB_pixel_format extensions
Additions/crOpenGL: moved the code from the Windows Additions to the common Additions code and enabled building for non-OSE Linux