Improved the incomplete type detection workaround for MSVC. It now

works even with the /vmg switch which makes all member pointers the
same size.


[SVN r19402]

libs/mpl

@@ -1 +1 @@
-Subproject commit 319ef0fffe996149616e4a3cec4ff1c2fcb3e08c
+Subproject commit bb3f38f02bddf05135302c79e3e299582bdac449