[TCLCORE] CONST86 and extensions

[Alexandre F. <ale...@gm...>]

Hi Jan,

I'm really ignorant about const-nightmares. I would just like a tiny
piece advice on how to handle CONST86 qualifiers that are present in
the generic stubs stable and thus could be accessed by extensions.
More concretely, Thread has a bunch of warnings due to not using the
qualifier when calling Tcl_GetObjType and assigning the result.
So: should extensions use CONST86 too ? (I know it is a compile-time
value, but it doesn't affect the ABI, right ?)

TIA,

-Alex