doc/INSTALL: resync from autoconf * doc/Makefile (INSTALL, INSTALL.ISO, INSTALL.UTF-8): Simplify. (INSTALL_PRELUDE): Delete; this is done more efficiently by moving... * install.texi [!autoconf]: ...here. Resync from autoconf. * INSTALL: Regenerate. * INSTALL.ISO: New file. * INSTALL.UTF-8: Likewise. Signed-off-by: Eric Blake <ebb9@byu.net>