time: Fix missing initialization of HAVE_TIMEZONE_T. * m4/time_h.m4 (gl_HEADER_TIME_H_DEFAULTS): Initialize HAVE_TIMEZONE_T here... * m4/sys_time_h.m4 (gl_HEADER_SYS_TIME_H_DEFAULTS): ... not here. * m4/time_rz.m4 (gl_TIME_RZ): Require gl_HEADER_TIME_H_DEFAULTS, not gl_HEADER_SYS_TIME_H_DEFAULTS. * modules/time_rz (Depends-on): Add 'time'. Remove useless quoting. (configure.ac): Remove useless quoting.