[m-rev.] for review: filename extensions

[Zoltan Somogyi]

> Intestingly enough this change did break something, while the C# grade
> bootchecks, library installation in the C# grade now causes the compiler
> to abort:
> 
>     Making mer_std.dll
> 
>     ...
> 
>     Uncaught Mercury exception:
>     Software Error: predicate `parse_tree.file_names.choose_file_name'/9:
>     Unexpected: unknown extension `int'
>     Stack dump not available in this grade.
>     gmake[1]: *** [libmer_std.install] Error 1
>     gmake[1]: Leaving directory

I think the attached diff should fix that. I just started a C# bootcheck of it;
you may wish to test a C# install.

>> The failures were news to me, since I never use subdirs of either flavor
>> with C grades. Does anyone? Is it even supposed to work?
> 
> --use-grade-subdirs is not supposed to work with mmake (only mmc --make).

Should we add an error message pointing out this fact if --use-grade-subdirs
is specified without --make or --invoked-by-mmc-make?
 
> --use-subdirs is supposed to work with mmake (if the user's guide is to
> be believed).

Has anyone tested that recently?

It would be nice if we had a continuous record of the success or failure
of a test case for this functionality ...

Zoltan.
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