Creates a GBytes from data.
When the last reference is dropped, free_func will be called with the
user_data argument.
data must not be modified after this call is made until free_func has
been called to indicate that the bytes is no longer in use.
Since 2.32
Creates a GBytes from data. When the last reference is dropped, free_func will be called with the user_data argument. data must not be modified after this call is made until free_func has been called to indicate that the bytes is no longer in use. Since 2.32