[Toybox] [PATCH] sed: add -z.

[enh]

Used to construct SELinux policies in the AOSP build.

I left loopfiles_lines with its hard-coded '\n' because although cut(1)
also has a -z option, I can't find any case where it's used in any of
the codebases searchable by me. (And fmt(1), the other user, doesn't
even have the option.) YAGNI.

Bug: http://b/122744241
---
 lib/lib.c        |  6 +++---
 lib/lib.h        |  2 +-
 tests/sed.test   |  2 ++
 toys/posix/sed.c | 25 +++++++++++++++----------
 4 files changed, 21 insertions(+), 14 deletions(-)
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