Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Remove mb-caching hack.

Obtained from: Fedora (Tim Waugh)

Make grep run much (~10x) faster in multibyte locales by caching the wide
character representation of input data across calls to dfaexec(), and by
caching the lengths of character across calls to check_multibyte_string().

Obtained from: Fedora (Tim Waugh)

Merge local changes.

Merge FreeBSD chagnes into GNU grep 2.4.

This is the stock 2.3 file (+ FreeBSD id). Since someone majorly SPAMMED
the repository by NOT vendor importing the virgin 2.0 sources, CVS had no
idea what to do here.

Back out the botched attempt to update to gnu grep 2.3 (lots of history
was lost). Restore original version to try and avoid breaking the build
while David O'brien does a proper set of imports and merges.

Requested by: obrien