Fix malloc/delete to malloc/free; and deprecate variable length array

[wegylexy]

1. g_value_dup_string() calls malloc() internally, so it should correspond to g_free() rather than operator delete()
2. standard C++ does not support variable length array
3. I made the above changes to get it compiled with Visual C++ because I need it to work on Windows.
4. This is my first time creating a pull request on GitHub. Please correct me if I do anything wrong.

[alumae]

Thanks!