Add a workaround for a strange bug on win64, when _ctypes is compiled
with the SDK compiler. This should fix the failing
Lib\ctypes\test\test_as_parameter.py test.
diff --git a/Lib/ctypes/__init__.py b/Lib/ctypes/__init__.py
index cdf6d36..f55d194 100644
--- a/Lib/ctypes/__init__.py
+++ b/Lib/ctypes/__init__.py
@@ -535,3 +535,9 @@
elif sizeof(kind) == 4: c_uint32 = kind
elif sizeof(kind) == 8: c_uint64 = kind
del(kind)
+
+# XXX for whatever reasons, creating the first instance of a callback
+# function is needed for the unittests on Win64 to succeed. This MAY
+# be a compiler bug, since the problem occurs only when _ctypes is
+# compiled with the MS SDK compiler. Or an uninitialized variable?
+CFUNCTYPE(c_int)(lambda: None)