[PATCH xserver] test: Fix build dependency for bigreq test

[Eric Anholt]

Adam Jackson <ajax at redhat.com> writes:

> libxcb-xinput isn't a thing in whichever Ubuntu it is that Travis is
> using. The test is already optional, make it more so.

We should probably be including current xcb in the docker image.  This
seems correct, though:

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