filesystems/sasquatch: New port: SquashFS extractor with patches for firmware analysis

The sasquatch project is a set of patches to the standard unsquashfs
utility (part of squashfs-tools) that attempts to add support for as
many hacked-up vendor-specific SquashFS implementations as possible.

It can be used in conjunction with binwalk to extract firmware images
where unsquashfs would fail.

https://gitlab.com/tgasiba/sasquatch/

Original project under: https://github.com/devttys0/sasquatch/

PR:	288914