Add /DLL right to the msvc.link.dll action, don't use any fancy flag

settings. This means that all targets linked with link.dll will always be
linked with /DLL flag, most notably PYTHON_EXTENSION.


[SVN r32959]

tools/build

@@ -1 +1 @@
-Subproject commit f66e61dec420f90e4f20481da2d7b64f3b9e01be
+Subproject commit 293e8e897862ce249e0e546e9f2533e20df7d1b3