* automake.in: Move the "main" code at the end.

* automake.in: Move the "main" code at the end.
(parse_arguments): Move near the end.
($KNOWN_EXTENSIONS_PATTERN, @known_extensions_list,
accept_extensions, var_SUFFIXES_trigger): Move these definitions
before any call to register_language.
(am_file): Move the definition with all other global variables,
do not use local to define it.
* Makefile.am (maintainer-check): Expect no `local' in Automake.