Generate man pages with UTF-8 characters

This fixes totally incorrectly rendered manual pages like
perlunicook and perltw.

TODO: should probably be a Configure option for proper upstreaming.

Bug-Debian: https://bugs.debian.org/840211

Gbp-Pq: Topic debian
Gbp-Pq: Name installman-utf8.diff

installman

@@ -161,6 +161,7 @@ sub pod2man {
 	$manpage = "${mandir}/${manpage}.${manext}";
 
         my $parser = Pod::Man->new( section => $manext,
+                                    utf8    => 1,
                                     official=> 1,
                                     center  => 'Perl Programmers Reference Guide'
                                   );