make it backwards compatible

paul-szczepanek-arm · paul-szczepanek-arm · commit 05a433749041 · 2018-10-04T16:12:26.000+01:00
diff --git a/platform/SharedPtr.h b/platform/SharedPtr.h
@@ -289,4 +289,6 @@ bool operator!= (U lhs, const SharedPtr<T> &rhs)
 
 } /* namespace mbed */
 
+using mbed::SharedPtr;
+
 #endif // __SHAREDPTR_H__
