Thanks for the report. This was caused by wrong flags in embed.fnc. Fixed by
7f974d7e9e13f5929bc0cfa52101160692c2d394
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Karl Williamson
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via perlbug: queue: perl5 status: new
https://rt.perl.org/Ticket/Display.html?id=130596
[perl #130596] Perl_utf8_to_uvchr_buf has no prototype in any .hfile
by Karl Williamson via RT