Initializes the GDK library and connects to the windowing system.
If initialization fails, a warning message is output and the application terminates with a call to `exit(1)`.
Any arguments used by GDK are removed from the array and argv.length and argv are updated accordingly.
GTK+ initializes GDK in gtk_init and so this function is not usually needed by GTK+ applications.
| argv |
the array of command line arguments. |
| argc |
the number of command line arguments. |