Build failure with `gettext 0.22`

[jpalus]

Attempt to build po4a 0.69 with gettext 0.22 fails with:

XX Update po/bin/po4a.pot
xgettext: Comment at or before ../../lib/Locale/Po4a/Sgml.pm:776 is not UTF-8 encoded.
          Please specify the source encoding through --from-code.
Undefined subroutine &PerlIO::F_UTF8 called at /usr/share/perl5/5.36.1/Pod/Man.pm line 799.
	...propagated at Po4aBuilder.pm line 58.
error: Bad exit status from /home/users/builder/tmp/rpm-tmp.m4NnqZ (%build)