portutil.tcl: Fix non-case-only renames
portutil.tcl: Fix non-case-only renames

Closes: https://trac.macports.org/ticket/55495
See: https://trac.macports.org/ticket/55492

neverpanic/macports-base,macports/macports-base,danchr/macports-base,danchr/macports-base,macports/macports-base,neverpanic/macports-base