Define several macros for use by the clean-temp module. * close-stream.m4 (gl_CLOSE_STREAM): Define GNULIB_CLOSE_STREAM. * fcntl-safer.m4 (gl_FCNTL_SAFER): Define GNULIB_FCNTL_SAFER. * stdio-safer.m4 (gl_FOPEN_SAFER): Define GNULIB_FOPEN_SAFER.