pythongh-114807: multiprocessing: don't raise ImportError if _multiprocessing is missing (python#114808)

`_multiprocessing` is only used under the `if _winapi:` block, this moves the import to be within the `_winapi` ImportError handling try/except for equivalent treatment.

Author: hoodmane

Lib/multiprocessing/connection.py

@@ -19,7 +19,6 @@
 import tempfile
 import itertools
 
-import _multiprocessing
 
 from . import util
 
@@ -28,6 +27,7 @@
 _ForkingPickler = reduction.ForkingPickler
 
 try:
+    import _multiprocessing
     import _winapi
     from _winapi import WAIT_OBJECT_0, WAIT_ABANDONED_0, WAIT_TIMEOUT, INFINITE
 except ImportError: