Repair for a regression in the test assign_to_array.cpp for Visual C++

up to but not including 7.1.  Appears to be an error in overload
resolution.


[SVN r23509]

libs/multi_array

@@ -1 +1 @@
-Subproject commit 91661f2f17c2832bf6d77f133354ddf30af1db94
+Subproject commit bb1b64be81e0f93fb64db514f05af788fcc1ad90