support/script/scancpan: don't generate the trailing slash in <PKG>_SITE variable

The trailing slash was removed in all packages, so don't generate it.
See http://git.buildroot.net/buildroot/commit/?id=c7f4b964718bc5a3329bb730f59e24091ecbc7a2

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/scripts/scancpan

@@ -636,6 +636,7 @@ while (my ($distname, $dist) = each %dist) {
         # the scheme is not used, because the job is done by the BR download infrastructure
         # the auth part is not used, because we use $(BR2_CPAN_MIRROR)
         my($filename, $directories, $suffix) = fileparse( $path, q{tar.gz}, q{tgz} );
+        $directories =~ s|/$||;
         my $dependencies = join q{ }, qw( = perl ),
                                       map( { q{host-} . fsname( $_ ); } sort @{$deps_build{$distname}} ),
                                       map( { fsname( $_ ); } sort @{$deps_runtime{$distname}} );