[m-rev.] for possible post-commit objection: remove a ten year old workaround

[Julien Fischer]

On Sat, 23 May 2020, Zoltan Somogyi wrote:

> We can back it out if this breaks anyone's workflow,
> but I don't think that is very likely.

...

> diff --git a/compiler/make.m b/compiler/make.m
> index a7d9ada29..2aaa246d7 100644
> --- a/compiler/make.m
> +++ b/compiler/make.m
> @@ -476,11 +476,7 @@ classify_target(Globals, FileName, ModuleName - TargetType) :-
> 
> classify_target_2(Globals, ModuleNameStr0, Suffix, ModuleName - TargetType) :-
>     ( if
> -        yes(Suffix) = target_extension(Globals, ModuleTargetType),
> -        % The .cs extension was used to build all C target files, but .cs is
> -        % also the file name extension for a C# file. The former use is being
> -        % migrated over to the .all_cs target but we still accept it for now.
> -        Suffix \= ".cs"
> +        yes(Suffix) = target_extension(Globals, ModuleTargetType)
>     then
>         ModuleNameStr = ModuleNameStr0,
>         TargetType = module_target(ModuleTargetType)

No objection, but did you check that anywhere we call mmc --make foo.cs
has been updated to use mmc --make foo.all_cs?

Julien.