[gfortran] Fix PR15481 and related bugs

[Paul Brook]

> 2004-07-09  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
>
> 	PR fortran/15481
> 	PR fortran/13372
> 	PR fortran/13575
> 	PR fortran/15978
> 	* module.c (write_symbol, write_symtree): Remove workaround.
> 	* primary.c (match_actual_arglist): Enhance comment.
> 	(gfc_match_rvalue): Handle function call with first argument
> 	a keyword argument correctly.
> 	* resolve.c (resolve_symbol): Change call to
> 	gfc_set_default_type to issue error if no implicit type
> 	can be found.
> 	* trans-decl.c (gfc_create_module_variable): Remove workaround.

Ok.

Paul