[Toybox] [PATCH] sed s///: support POSIX I as synonym for i

[enh]

POSIX chose I rather than i as the case-insensitive flag for s///,
because apparently more seds support I than i. We're allegedly alone in
only supporting i. (On the Mac, sed supports neither.)

Strictly this isn't *currently* in POSIX, but it's been accepted for
issue 8.

Bug: https://austingroupbugs.net/view.php?id=779#c2050
---
 tests/sed.test   | 2 ++
 toys/posix/sed.c | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)
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