Issue #18441: Make test.support.requires('gui') skip when it should.
(Consolidating this check and various checks in tkinter files and moving them
to test.support and test.regrtest will be another issue.)
Issue #18439: Make patchcheck work on Windows for ACKS, NEWS.
Issue #18439: Move news entry misplaced by graft merge.
Issue #18441: fix buildbot name-error for TclError.
Backed out changeset: 9f922270a929 so can backout larger patch
Backed out changeset: 23b0164b9c82 #18441 not working