[Tk] (chrstphrchvz) com (6051a9fc-win-arc-small): Cherry-pick François' approach, revised to work correctly for arcs which round to 360 degrees

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Commit [06a80feb6edd0aa699b5f47f25d02941d70c6c7fc2d4b3d887f348a4cea19180]
  By      chrstphrchvz
  For     Tk (branch: 6051a9fc-win-arc-small)
  On      2025-10-18T21:42:12.557
  Details https://core.tcl-lang.org/tk/info/06a80feb6edd0aa699b5f47f25d02941d70c6c7fc2d4b3d887f348a4cea19180

Description
   Cherry-pick François' approach, revised to work correctly for arcs
   which round to 360 degrees

Changed Files
  1 edited
           win/tkWinDraw.c

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