libregex: fix sed regression (thans spew)

I introduced a regression in sed that currently has screwed up
/sys/lib/man/secindex.

The issue is that sed 's/$/ foo/g' will actually replace the newline
character with foo instead of just appending at the end of the line.
This only makes a difference when sed is operating on a multiple line
record. The effect is a record like:

foo
bar
baz

becomes:

foo foobar foo baz foo

instead of

foo foo
bar foo
baz foo

0 files changed, 0 insertions, 0 deletions