fix(Exception): static assert to make sure that _HAS_EXCEPTIONS is set (

#4668).

Foundation/include/Poco/Exception.h

@@ -100,9 +100,15 @@ class Foundation_API Exception: public std::exception
 private:
 	std::string _msg;
 	Exception*  _pNested;
-	int			_code;
+	int			_code;    
 };
 
+#if defined(_HAS_EXCEPTIONS)
+    // Size of Poco::Exception depends on the exception settings (like _HAS_EXCEPTIONS)
+    // that might influence size of std::exception from which Poco::Exception is derived from.
+    // It is expected that Poco libraries and application using Poco have the same settings.
+    static_assert(_HAS_EXCEPTIONS != 0);
+#endif
 
 //
 // inlines