Function gio_sys::g_file_set_attribute

pub unsafe extern fn g_file_set_attribute(file: *mut GFile,
                                          attribute: *const c_char,
                                          type_: GFileAttributeType,
                                          value_p: gpointer,
                                          flags: GFileQueryInfoFlags,
                                          cancellable: *mut GCancellable,
                                          error: *mut *mut GError)
                                          -> gboolean