Fix manpage section of perl module documentation

On Debian (at least) perl documentation is supposed to be installed in
section 3pm. With the build system hardcoding this to 3 instead this
results in a warning by the Debian package linter:

	W: public-inbox: wrong-manual-section usr/share/man/man3/PublicInbox::Git.3.gz:74 3 != 3pm
	W: public-inbox: wrong-manual-section usr/share/man/man3/PublicInbox::Import.3.gz:74 3 != 3pm
	W: public-inbox: wrong-manual-section usr/share/man/man3/PublicInbox::SaPlugin::ListMirror.3.gz:74 3 != 3pm
	W: public-inbox: wrong-manual-section ... use --no-tag-display-limit to see all (or pipe to a file/program)

So use "$(MAN3EXT)" instead of "3".

(cherry picked from commit cd12cf22c4d161b7aec819f45628b983f0bd675d)

diff --git a/Makefile.PL b/Makefile.PL
index f6b7abb65647164193f576a78fb688f9593212e5..c834910cb1a9fec7f8511f0bd6b58ebe97dd0093 100644 (file)
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -107,7 +107,7 @@ my %man3 = map {; # semi-colon tells Perl this is a BLOCK (and not EXPR)
        my $mod = $base;
        $mod =~ s!/!::!g;
        $mod =~ s/\.\w+\z//;
-       "lib/PublicInbox/$_" => "blib/man3/PublicInbox::$mod.3"
+       "lib/PublicInbox/$_" => "blib/man3/PublicInbox::$mod.\$(MAN3EXT)"
 } qw(Git.pm Import.pm WWW.pod SaPlugin/ListMirror.pod);
 
 WriteMakefile(