on x64: torsocks --shell: [syscall] Unsupported syscall number 157

Following the update at https://stackoverflow.com/questions/46634215/torsocks-and-unsupported-syscalls

arch is x64.

torsocks --shell warns

[syscall] Unsupported syscall number 157. Denying the call (in tsocks_syscall() at syscall.c:615)

grep 157 arch/x86/entry/syscalls/syscall*tbl syscall_32.!tbl:157 i386 sched_getscheduler sys_sched_getscheduler !__ia32_sys_sched_getscheduler syscall_64.!tbl:157 common prctl !__x64_sys_prctl

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