[PATCH] Update irregex to 0.9.7

[Peter Bex]

Hi all,

Here's another patch to update irregex to the 0.9.7 release, which
makes irregex-split, irregex-fold and irregex-replace behave consistently,
both internally and in comparison to other regex engines when dealing
with empty matches.

After this I think we can start the 5.2.0 release process.

Cheers,
Peter

0001-Update-irregex-to-the-0.9.7-release-upstream-commit-.patch
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