multilib: move to contrib This follows up on commit v1.11-665-gc5df21e of 2012-01-17, "multilib: deprecate, will be moved to contrib". See also: <http://lists.gnu.org/archive/html/automake-patches/2012-01/msg00109.html> * NEWS: Update. * automake.in ($seen_multilib): Remove. (scan_autoconf_traces): Don't trace 'AM_ENABLE_MULTILIB', and don't handle it anymore. (handle_multilib): Remove. (generate_makefile): Don't call it anymore. * doc/automake.texi: Remove documentation about multilib support, related macros, and helper files. * m4/multi.m4: Delete. * m4/Makefile.am (dist_automake_ac_DATA): Remove it. * lib/am/multilib.am: Delete. * lib/am/Makefile.am (dist_am_DATA): Remove it. * contrib/multilib/multilib.am: New file, adapted from extracts of a Makefile.in generated with automake multilib support. We did this instead of moving and editing 'lib/am/multilib.am' because it allows us to license this file with a liberal license that will permit users to copy-and-paste it in non-GPLed Makefile.am files too). * lib/symlink-tree, lib/config-ml.in: Move ... * contrib/multilib: ... in here. * lib/Makefile.am (dist_script_DATA, dist_pkgvdata_DATA): Update. * contrib/multilib/README: New file. * contrib/Makefile.am (EXTRA_DIST): Add the files created or moved in 'contrib/multlib'. * tests/multilib.test: Update and enhance a little. * tests/help-multilib.test: Likewise.