gh-151881: Skip tk_inactive negativity check on Windows

On Windows ``Tk_GetUserInactiveTime()`` computes the inactivity interval
as a C ``long``, which is only 32-bit there.  On a non-interactive
session (e.g. a buildbot running as a service) the interval can exceed
2**31 ms and overflow to a negative value, making the test fail.
Guard the lower-bound check on the win32 windowing system pending the
Tk-side fix (Tk ticket 3cb7c4ac72d4).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: serhiy-storchaka

Lib/test/test_tkinter/test_misc.py

@@ -592,7 +592,11 @@ def test_tk_inactive(self):
         ms = self.root.tk_inactive()
         self.assertIsInstance(ms, int)
         # A count of milliseconds, or -1 if the windowing system lacks support.
-        self.assertGreaterEqual(ms, -1)
+        if self.root._windowingsystem != 'win32':
+            # On Windows the inactivity time is computed as a C long, which is
+            # only 32-bit there, so on a non-interactive session it can exceed
+            # 2**31 ms and overflow to a negative value (Tk ticket 3cb7c4ac72d4).
+            self.assertGreaterEqual(ms, -1)
         # Resetting the timer returns None and does not raise.
         self.assertIsNone(self.root.tk_inactive(reset=True))