Log Message:
Update Tk to 8.6.9.1 to fix PR pkg/54324.

ok during freeze jperkin@

 Alongside the Tcl/Tk 8.6.9 releases just announced, you will find one
 additional file, tk8.6.9.1-src.tar.gz . This is an errata release
 fixing a critical error on the Mac OSX 10.14 Mojave platform only.
 If you are building Tk for any other platform, there is no need to
 upgrade to the errata release. If you do upgrade to it anyway, you will
 see no difference, so it will be harmless through wasted effort, as the
 details below will explain.

 When unpacked, the errata archive differs from the tk8.6.9-src.tar.gz
 contents in only three lines of the file
     tk8.6.9/macosx/tkMacOSXWindowEvent.c
 which is a file compiled only for Mac OSX builds of Tk. The lines are
 written to have effect only on Mojave. Every other byte of the source
 code distribution is unchanged.