[2.7] bpo-33280: Reorganize external Tcl/Tk references. (GH-6473). (GH-6607)

(cherry picked from commit 67a8f4fed3169e1b8c947c10f6e06863e399ae32)

Co-authored-by: Andrés Delfino <34587441+andresdelfino@users.noreply.github.com>
1 file changed