Disable strict pixi requirement for libavif >= 0.9.1

Some AVIF image generators didn't include the PixelInformationProperty
(pixi), even though strictly speaking they should. In v0.9.2,

Disable strict pixi requirement for libavif >= 0.9.1

Some AVIF image generators didn't include the PixelInformationProperty
(pixi), even though strictly speaking they should. In v0.9.2, libavif
began requiring this. Let's disable it so we can read those images too.

We also remove xfail from test on FreeBSD.

Closes GH-7253.

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Temporarily disable imagecreatefromstring_avif.phpt on FreeBSD

This test recently started failing on Cirrus CI, possibly after
a libavif update.

Disable it until the issue has b

Temporarily disable imagecreatefromstring_avif.phpt on FreeBSD

This test recently started failing on Cirrus CI, possibly after
a libavif update.

Disable it until the issue has been investigated, to avoid an
always failing job.

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AVIF support for getimagesize() and imagecreatefromstring()

Thanks to Joe Drago for help with the AVIF detection code.

Co-authored-by: Nikita Popov <nikita.ppv@googlemail.com>
C

AVIF support for getimagesize() and imagecreatefromstring()

Thanks to Joe Drago for help with the AVIF detection code.

Co-authored-by: Nikita Popov <nikita.ppv@googlemail.com>
Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

Closes GH-7091.

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