[m-rev.] Fwd: for review: fix obsolete tcl-tk code in extras/graphics/mercury_tcltk

[Fabrice Nicol]

Hi Julien,
> According the Tcl/Tk documentation TCL_DYANMIC is for when the memory
> referenced by the result field is allocated using the Tcl_Alloc()
> function.  (Memory allocated by Mercury's GC is definitely *not*
> allocated using this function.)
>
> I think the safest approach here is to get the result string from
> Mercury, copy it into memory allocated using Tcl_Alloc() and then
> pass that to Tcl_SetResult().
>
Ok, I hope the attached patch sets things straight if TCL_DYNAMIC is to 
be preferred.

In the process, I added a missing foreign_enum pragma for Mercury type 
'tcl_status' (see commit message).

Fabrice




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