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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