Remove man pages from package.xml

This fixes the following error:

    # pear upgrade PEAR-1.10.0beta1.tgz
    File "man5/pear.conf.5" in directory "<dir name="/">" has invalid role "man", should be one of cfg, data, doc, php, script, test, www
    File "man1/pecl.1" in directory "<dir name="/">" has invalid role "man", should be one of cfg, data, doc, php, script, test, www
    File "man1/peardev.1" in directory "<dir name="/">" has invalid role "man", should be one of cfg, data, doc, php, script, test, www
    File "man1/pear.1" in directory "<dir name="/">" has invalid role "man", should be one of cfg, data, doc, php, script, test, www
    Parsing of package.xml from file "/tmp/pear/temp/pearIYiX6j/package.xml" failed
    upgrade failed

Man pages will be packaged seperately.