Function glib_sys::g_log_writer_standard_streams

pub unsafe extern "C" fn g_log_writer_standard_streams(
    log_level: GLogLevelFlags, 
    fields: *const GLogField, 
    n_fields: size_t, 
    user_data: gpointer
) -> GLogWriterOutput

This is supported on crate feature v2_50 only.