[patch, libfortran] PR36094 Runtime error show_locus not working correctly

[Jerry DeLisle]

Hi,

This simple patch takes care of the case where filename_from_unit returns NULL. 
If a filename is not yet associated with the given unit when an error occurs, 
show_locus will show unit number by itself.

The patch also comments out a portion of the encoding_options array so that 
"utf-8" throws a runtime error.

I will commit as obvious and simple if regression testing passes.

Jerry

2008-04-30  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libfortran/36094
	* runtime/error.c (show_locus): Provide modified error message when
	filename has not yet been associated with a unit number.
	* io/open.c (encoding_opt[]): Comment out "utf-8" option and add TODO.
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