[PATCH xserver] xfree86: Hush some warnings when Xv is disabled

[Eric Anholt]

Adam Jackson <ajax at redhat.com> writes:

> Spotted by Appveyor:
>
> xf86Crtc.c:3281:1: warning: ‘xf86_crtc_box_area’ defined but not used [-Wunused-function]
>  xf86_crtc_box_area(BoxPtr box)
>  ^~~~~~~~~~~~~~~~~~
> xf86Crtc.c:3268:1: warning: ‘x86_crtc_box’ defined but not used [-Wunused-function]
>  x86_crtc_box(xf86CrtcPtr crtc, BoxPtr crtc_box)
>  ^~~~~~~~~~~~
> xf86Crtc.c:3256:1: warning: ‘x86_crtc_box_intersect’ defined but not used [-Wunused-function]
>  x86_crtc_box_intersect(BoxPtr dest, BoxPtr a, BoxPtr b)
>  ^~~~~~~~~~~~~~~~~~~~~~

Mesa has started using their _X_UNUSED equivalent for stuff like this,
so that things are compiled either way but DCEed without complaint when
the caller is disabled.  However, this is also a correct cleanup, so:

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