fix index_binding_helper in MSVC

Author: Marcin Sobieszczanski

hdr/sqlite_modern_cpp.h

@@ -29,7 +29,7 @@ namespace sqlite {
 	template<class T, bool Name = false>
 	struct index_binding_helper {
 		index_binding_helper(const index_binding_helper &) = delete;
-#if __cplusplus < 201703
+#if __cplusplus < 201703 || _MSVC_LANG <= 201703
 		index_binding_helper(index_binding_helper &&) = default;
 #endif
 		typename std::conditional<Name, const char *, int>::type index;