[PATCH xserver] glamor: Rename var in glamor_xv, SAMPLE is GLSL keyword

[Eric Anholt]

Corentin Rossignon <corossig at gmail.com> writes:

> From: Corentin Rossignon <corentin.rossignon at gmail.com>
>
> This fix issue with gnome-shell and playing video using xv
>
> Signed-off-by: Corentin Rossignon <corentin.rossignon at gmail.com>
> Bugzilla: https://bugs.freedesktop.org/104405

This is weird -- sample is only a keyword in late versions of GLSL, and
we shouldn't be requesting a late version of GLSL (#version exists so
that the language can evolve without breaking old shaders!)  What driver
was doing this?
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