[PATCH] Update irregex to 0.9.11

[Peter Bex]

Hi all,

Here's a patch to bring irregex in line with upstream 0.9.11 (plus one
more commit that fixes a bug in sre->string).  It would be nice to have
that for 5.4.0.

Not that much changed in this release, but a lot of code was
restructured, so it would make it easier to port future changes once
this has been applied.

Also, there are a few fixes related to utf8-mode, so maybe these help
with the UTF-8 branch.

Cheers,
Peter

0001-Bump-irregex-to-upstream-commit-923cfc39-which-is-0..patch
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