Retiring yap (Prolog interpreter)

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I'm deeply sorry I will have to retire yap package because:

It crashes on i686 after updating GCC to 7
<https://bugzilla.redhat.com/show_bug.cgi?id=1421711>.
Last stable version is 7 years old (we have it in Fedora).
Last development version is 4 years old (Jerry James tried to update
but it does not work with non-lazy linking) and it fails on i686 too <https://koji.fedoraproject.org/koji/taskinfo?taskID=18014527>.
Upstream does not respond
<https://sourceforge.net/p/yap/mailman/message/35663387/> and playing
with the code reveals other bugs like signed interger overflows or
linkage failure with disabled optimizations because of wrong inlining.
Finally I don't understand the code especially the stack-based
interpreter.

The only reverse dependency is ppl where the yap support is optional.

If there is nobody who wants to adopt the yap, I will retire it in
a week.

-- Petr
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