* config.shared: Emit everything which needs to be re-definable
        via file descriptor 1; the generic stuff is emitted using redirection
        onto fd 2.
        * configure.in (package_makefile_rules_frag): New variable
        which is used in the call to config.shared; redirect file descriptor 2
        to ${package_makefile_rules_frag}.

From-SVN: r17523