Function gio_sys::g_subprocess_communicate_utf8

pub unsafe extern fn g_subprocess_communicate_utf8(subprocess: *mut GSubprocess,
                                                   stdin_buf: *const c_char,
                                                   cancellable: *mut GCancellable,
                                                   stdout_buf: *mut *mut c_char,
                                                   stderr_buf: *mut *mut c_char,
                                                   error: *mut *mut GError)
                                                   -> gboolean