[Chicken-hackers] [PATCH] Irregex-fold infinite loop bugfix

[Peter Bex]

Hello hackers,

The attached patch brings our irregex code up-to-date with the latest
fixes in upstream applied by Alex (also in the irregex-bugfixes branch).

It fixes a problem with irregex-fold that caused it to hang when it
matched an empty submatch, as shown by this simple code:
(irregex-fold '(* "a") void #f "ab")

Cheers,
Peter
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0001-Apply-upstream-changesets-ba70feace1dd-and-78ba6b09e.patch
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