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If GNULIB_LOCALENAME_SINGLE_THREAD is defined, omit locks in localename and getlocalename-related functions. Useful for GNU grep; see <https://bugs.gnu.org/81515>. * lib/getlocalename_l-unsafe.c, lib/getlocalename_l.c: * lib/localename.c (USE_ISOC_AND_POSIX_THREADS, USE_ISOC_THREADS) (USE_POSIX_THREADS, USE_WINDOWS_THREADS) [GNULIB_LOCALENAME_SINGLE_THREAD]: Undef.