[issue27647] Update Windows build to Tcl/Tk 8.6.6

[Terry J. Reedy]

Terry J. Reedy added the comment:

I think 3.4 and 3.5 were pretty current as of .0 release, or certainly as of .0b1.  Have we updated to new unicode (9.0), like tcl?  Martin used to do that.

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