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35aa8dba - Support creating shared libraries on Hurd/x86_64.

Support creating shared libraries on Hurd/x86_64. Patch from <https://lists.gnu.org/archive/html/bug-hurd/2023-05/msg00086.html>. * m4/libtool.m4 (_LT_ENABLE_LOCK): Treat Hurd/x86_64 like Linux/x86_64.