[3.14] pythongh-138801: re-enable pyrepl tests on Windows (pythonGH-138802) (pythonGH-138815)

pythongh-138801: re-enable `pyrepl` tests on Windows (pythonGH-138802)
(cherry picked from commit 4f3cab9)

Co-authored-by: Chris Eibl <[email protected]>

Author: miss-islington

Lib/test/test_pyrepl/__init__.py

@@ -1,14 +1,10 @@
 import os
-from test.support import load_package_tests
-import unittest
+import sys
+from test.support import import_helper, load_package_tests
 
 
-try:
-    import termios
-except ImportError:
-    raise unittest.SkipTest("termios required")
-else:
-    del termios
+if sys.platform != "win32":
+    import_helper.import_module("termios")
 
 
 def load_tests(*args):