Squash 4.3

First release in 3 years brings Squash 4.3.

Please don’t merge this until #32755 is merged.
Squashfm 4.3

This will probably fail the bot, but I wanted to check my debug failure
locally matched the bot’s.
squashfs 4.3

Stole the patch from over
[here](https://github.com/plougher/squashfs-tools/pull/3) and manually
applied it to avoid the merge conflicts. Houston, We have build success.
squashfs: add 4.3 bottle.