[Bug 207681] [libc] re-enable regex bayer-moore for the general multibyte case

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207681

            Bug ID: 207681
           Summary: [libc] re-enable regex bayer-moore for the general
                    multibyte case
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: pfg at FreeBSD.org

Created attachment 167690
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=167690&action=edit
Enable regex multibyte support

Our regex(3) added full multibyte support since r132019, however it was
disabled for the general case. According to the commit:

"One other point of interest is that although the Boyer-Moore algorithm had
to be disabled in the general multibyte case, it is still enabled for UTF-8
because of its self-synchronizing nature. This greatly speeds up matching
by reducing the number of multibyte conversions that need to be done."

Now that we have support for collation in 11-current, the multibyte support has
all the chances of working correctly so we could enable it.

This seems to be much easier than replacing regex with a new version, but it
has yet to be tested thoroughly.

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