build.sh: minor cleanup.
    groups/2*.native_packages_*.group: adds dependencies.
    subr/{build_init,ex_pkg_dispatch}.subr, etc/build.usage: forcibly rebuild all dependencies w/ -r **[ ...] vs. -r *[ ... ].
    subr/ex_pkg_dispatch.subr:exp_pkg_get_packages(): log message before and after resolving dependencies.