* automake.in (handle_aclocal_m4): Use new MAINTAINER_MODE

	* automake.in (handle_aclocal_m4): Use new MAINTAINER_MODE
	conditional.
	(handle_configure): Likewise.
	(read_am_file): Likewise.
	(file_contents_with_transform): Likewise.
	(scan_one_configure_file): Recognize that AM_MAINTAINER_MODE
	defines a conditional.
	* automake.texi (Optional): Document new AM_MAINTAINER_MODE.
	* texi-vers.am ($(srcdir)/@VTEXI@): Look at MAINTAINER_MODE
	conditional.
	(maintainer-clean-@VTI@): Likewise.
	* remake.am ($(srcdir)/configure): Look at MAINTAINER_MODE
	conditional.
	* remake-hdr.am ($(srcdir)/@CONFIG_HEADER_IN@): Look at
	MAINTAINER_MODE conditional.
	* m4/maintainer.m4 (AM_MAINTAINER_MODE): Defined MAINTAINER_MODE
	conditional.