Log Message:
libheif: update to 1.17.5.

1.17.5

Fixes installation of the Gnome "heif.thumbnailer" config file.
No other fixes than that.

1.17.4

Fixes:

    ispe boxes in AVIF images with clap boxes were written with the wrong size \ 
(would only happen with svt-av1 encoder),
    always output MIAF brand for AVIF images
    fix kvazaar encoding with odd image sizes and encodings with non-4:2:0 chroma