shared: add nm_cmp_int2ptr_p_with_data() helper
A cmp() implementation, for sorting an array with pointers, where each pointer is an inteter according to GPOINTER_TO_INT(). That cames for example handy, if you have a GHashTable with keys GINT_TO_POINTER(). Then you get the list of keys via g_hash_table_get_keys_as_array() and want to sort them.
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