`tail -c` is however. Since we used `head -c-`, to cut off characters from the
end, the POSIX-compliant `wc -c` is used for a `strlen` we can proceed to do
the necessary arithmetic off of.
Credit to @PlasmaPower for identifying this non-compliant behavior which
necessitated this fix in response.
Updates our scripts to pass. Achieves POSIX compliance for
`increase_default_stack_size.sh` via replacing `hexdump` with `od` and `tr`.
Replaces the non-POSIX `dd status=none` with the POSIX `dd 2> /dev/null`.
While prior this didn't work well, presumably due to stack size limitations,
a shell script is included to raise the default stack size limit. This should
be tried again.
