sasquatch can't handle version 2 with non-standard (sqlz) magic

[qkaiser]

The attached sample (09bc2ac3b35d7475f6d2e2283c73ea275a9d6876.zip) comes from a TrendNet firmware.

When trying to extract it with sasquatch, we get the following output:

sasquatch -be /tmp/sample.sqlz
Non-standard SquashFS Magic: 'sqlz'
Reading a different endian SQUASHFS filesystem on /tmp/sample.sqlz
FATAL ERROR: Can't find a valid SQUASHFS superblock on /tmp/sample.sqlz

The old sasquatch version running on squashfs-tools 4.3 can extract the sample. We need to investigate which patch made it stop working and find a fix. Probably similar to #18

Reported by @m-1-k-3