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mksquashfs: Catch errors with mksquashfs and report them

The host system can run out of space while running mksquashfs, and while
this is logged to program.log it isn't detected by lorax or
livemedia-creator so it will continue running, possibly reporting
unrelated errors and causing confusion.

This adds checks for the return status when calling mksquashfs, logs it
to the log, and either exits or raises an error immediately.

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