[PATCH xserver] xephyr: Check for host XVideo support before trying to use it

[Eric Anholt]

Adam Jackson <ajax at redhat.com> writes:

> Otherwise xcb will treat our attempt to send xv requests as a connection
> error (quite reasonably: we're asking it to emit a request for which
> there is no defined major opcode), and we'll die quietly the first time
> we hit KdBlockhandler.

Reviewed-by: Eric Anholt <eric at anholt.net>
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