lang/tclX: fix fetch (+)

> Attempting to fetch http://core.tcl.tk/tclconfig/raw/tcl.m4?name=2e84c8

fetch: http://core.tcl.tk/tclconfig/raw/tcl.m4?name=2e84c8: Host does not resolve

Project tclconfig moved to new home: https://core.tcl.tk => https://core.tcl-lang.org

Reported by: bulk -t
Approved by: portmgr blanket