gh-149879: Don't import msvcrt in _pyio on Cygwin (#149899)

The msvcrt extension module cannot be built on Cygwin.

diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 3306c8a274760be525c89d7ae9fd29a4b4216e36..1b5b75ef566a32b01719a97076a1d67aceb10f19 100644 (file)
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -10,7 +10,7 @@ import stat
 import sys
 # Import _thread instead of threading to reduce startup cost
 from _thread import allocate_lock as Lock
-if sys.platform in {'win32', 'cygwin'}:
+if sys.platform == 'win32':
     from msvcrt import setmode as _setmode
 else:
     _setmode = None