[TCLCORE] Tcl build broken for core-8-6-branch

[Marc C. <cul...@gm...>]

When I tried to make a 1-line change to the Tcl unix/configure.in I found
that commit e2f55d6060 <https://core.tcl-lang.org/tcl/info/e2f55d60603a87a3>
had broken the build for core-8-6-branch.  The error is:

error: use of undeclared identifier 'tclWideIntType'; did you mean
'tclIntType'?
                || (intObj->typePtr != &tclWideIntType)

- Marc