Fix imagecreatefromavif() memory leak

This has been reported as https://github.com/libgd/libgd/issues/831.
We port the respective fix to our bundled libgd.

Closes GH-8812.

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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Backport libgd commit

Source - https://github.com/libgd/libgd/commit/f6a111c632fcf76dd3a42d750f18d2ed7bf8a5f1
Related to https://github.com/php/php-src/pull/5127#issuecomment-884032991

Add avif support to ext/gd

This backports avif support from upstream libgd into bundled libgd
and exposes the functionality through new imagecreatefromavif()
and imageavif() function

Add avif support to ext/gd

This backports avif support from upstream libgd into bundled libgd
and exposes the functionality through new imagecreatefromavif()
and imageavif() functions.

Closes GH-7026.

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

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