gh-131189: Fix "msvcrt" import warning on Linux when "_ctypes" is not available. (GH-131201)

Fix "msvcrt" import warning on Linux when "_ctypes" is not available.

On Linux, compiling without "libffi" causes a
"No module named 'msvcrt'" warning when launching PyREPL.

Author: plashchynski

Lib/_pyrepl/readline.py

@@ -43,10 +43,11 @@
 
 Console: type[ConsoleType]
 _error: tuple[type[Exception], ...] | type[Exception]
-try:
-    from .unix_console import UnixConsole as Console, _error
-except ImportError:
+
+if os.name == "nt":
     from .windows_console import WindowsConsole as Console, _error
+else:
+    from .unix_console import UnixConsole as Console, _error
 
 ENCODING = sys.getdefaultencoding() or "latin1"