[Toybox] [PATCH] tail: add the long option synonyms for -n and -c.

[enh]

Believe it or not -- I struggle to believe it myself -- we've been
ignoring tail's complaint that it doesn't know what --bytes means in the
Android CI infrastructure since at least mid-2019. (To be fair, today
wasn't the first time I'd seen that error message scroll by myself,
but it was the first time I've bothered/had time to investigate.)

Statically (via a code search), I also see references to --lines, and
toybox head already has the --bytes and --lines synonyms, so I've added
that here too, even though I haven't strictly seen anyone trying/failing
to use that personally yet.
---
 toys/posix/tail.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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