glx: make xf86vidmode mandatory for direct rendering

Currently we detect the module and if missing, the glXGetMsc* API is
effectively a stub, always returning false.

This is what effectively has been happening with our meson build :-(

Thus users have no chance of using it - they cannot even distinguish
if the failure is due to a misconfigured build.

There's no reason for keeping xf86vidmode optional - it has been
available in all distributions for years.

Cc: [email protected]
Signed-off-by: Emil Velikov <[email protected]>
Acked-by: Dylan Baker <[email protected]>
Reviewed-by: Eric Engestrom <[email protected]>
Fixes: a47c525f3281a2753180e "meson: build glx"

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