Fix compiler warnings throughout.

Fix compiler warnings throughout.
* pkg.c (init_pkgs): Make static 'stuff' global_pkgstuff for use in
get_pkg_stuff.
* setup.c: Make 'root' global.
(istargz): Return pointer to "stem" of matched .tar.gz file.
(tarx): Special case cygwin-20000301 to == cygwin-1.1.0.tar.gz.  Remove bogus
check_for_installed check.
(recurse_dirs): Add preliminary support for .bat file execution.
(create_uninstall): Eliminate unneeded parameter.
(do_start_menu): Ditto.
(mkmount): Ditto.
(get_pkg_stuff): Ditto.  Check for currently installed cygwin by scanning for
the version number.  Eliminate unneeded argument to create_uninstall.
(getdownloadsource): Add 'name' to list of names rather than url.
(main): Eliminate unneeded argument in get_pkg_stuff.  Eliminate unneeded
argument in mkmount and do_start_menu.