gh-124111: Fix TCL 9 threaded detection #128103
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Original threaded detection doesn't work with TCL 9. Instead setting to always enable threaded based on release note for TCL 9+
https://sourceforge.net/projects/tcl/files/Tcl/9.0.0/tcl-release-notes-9.0.0.md/download:
Notes
gh-124111
as it was for general TCL 9 support (similarly piggy-backing off NEWS blurb as wasn't in stable release). Could create a separate issue/blurb if preferred.TCL_MAJOR_VERSION
as original logic was for looking for threaded in TCL. Could checkTK_MAJOR_VERSION
instead as the major versions should be the same.