Avoid using incompatible pointer type for old_warn
#101
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See #98 (comment): Newer compilers may have
-Werror=incompatible-pointer-typesby default.PL_curcop->cop_warningspreviously had typeSV *, thenSTRLEN *, and nowchar *as of Perl 5.37.6. Sinceold_warnis only used to temporarily hold the value fromPL_curcop->cop_warningswithout dereferencing it,old_warncan instead be declared asvoid *regardless of Perl 5 version.