largefile: sync from Autoconf master * m4/largefile.m4 (gl_SET_LARGEFILE_SOURCE): Test whether AC_SYS_YEAR2038 is defined when this macro is defined, not when it is used, as we now define AC_SYS_YEAR2038 later. (_AC_SYS_LARGEFILE_MACRO_VALUE): Remove. (_AC_SYS_YEAR2038_TEST_CODE, _AC_SYS_YEAR2038_OPTIONS) (_AC_SYS_YEAR2038_PROBE, _AC_SYS_YEAR2038_ENABLE) (_AC_SYS_YEAR2038_OPT_IN, AC_SYS_YEAR2038) (_AC_SYS_LARGEFILE_TEST_CODE, _AC_SYS_LARGEFILE_OPTIONS) (_AC_SYS_LARGEFILE_PROBE, _AC_SYS_LARGEFILE_ENABLE): New macros. (AC_SYS_LARGEFILE): Use them. * m4/year2038.m4: Remove. All mentions removed. * modules/largefile, modules/year2038 (configure.ac-early): Do not require gl_YEAR2038_EARLY. * modules/year2038 (Depends-on): Depend on largefile. (configure.ac): Require AC_SYS_YEAR2038, not gl_YEAR2038.