Fix #347: No data compression

[goldstar611]

Fixes #347

mksquashfs has an option -no-compression [1] but it seems to have been released about 10 months ago [2] and not widely available, especially on older OS installations.

Switch to a more widely available -noDatacompression option instead. [3] [4]

1. https://www.mankier.com/1/mksquashfs
2. https://github.com/plougher/squashfs-tools/blame/1c791c5bdd2307458088e1f0821d9cefd14e0c96/README-4.6.1#L83
3. https://manpages.debian.org/jessie/squashfs-tools/mksquashfs.1.en.html
4. https://manpages.ubuntu.com/manpages/focal/man1/mksquashfs.1.html