xwin/glx: Enable GLX_SGI_make_current_read unconditionally (v2)

This seems to be fairly universal these days, and if it doesn't exist
the only thing you break is separate drawable and readable, which is a
rare feature to use. So pretend it's always there and just throw an
error on MakeCurrent if it isn't, and don't consider it when computing
the GLX version number.

v2: Fix type-o for glxWinScreen (Jon Turney)

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>

0 files changed, 0 insertions, 0 deletions