main/squashfs-tools: upgrade to 4.4

remove CVE-2015-4645.patch, fixed upstream
remove fixes from fix-compat.patch which are applied upstream
change package url to github where development moved
change source url to github
remove prepare function which is not needed and use default
fix builddir variable
add zstd compression support
1 job for !54 with squashfs-tools-4.4 in 19 seconds (queued for 3 seconds)
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failed #710
x86_64 docker-alpine allowed to fail
lint

00:00:19

 
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failed
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