[Piglit] [PATCH] glean: Drop TIFF (and PNG and ZLIB) dependencies.

[Eric Anholt]

jfonseca at vmware.com writes:

> From: José Fonseca <jose.r.fonseca at gmail.com>
>
> Not actually necessary. rgbTriStrip test used it but it was just a proof
> of concept, never part of any test list.
>
> This greatly simplifies building piglit for Windows.

I know Ken's got a series laying around to remove a bunch more garbage
From glean, but this is a great start.

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