Add shared_array to vc8 solution.

Fix shared_xxx::operator=.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@669 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/BoostWorkaround/boost/shared_array.hpp

@@ -114,11 +114,13 @@ public:
 
 	shared_array& operator= (const shared_array& r) {
 		if(r == *this) {
-			return;
+			return *this;
 		}
 		ctr->decref(ptr);
 		ctr = r.ctr->incref();
 		ptr = r.ptr;
+
+		return *this;
 	}
 
 	// automatic destruction of the wrapped object when all