[strace/strace] Add -n/--syscall-number option (#149)

[Dmitry V. Levin]

@ldv-alt commented on this pull request.



> +		const long args[] = { 0, 0 };
+		syscall(__NR_socketcall, SC_listen, args);
+		printf("[%4u] listen(0, 0) = -1 ENOTSOCK (%m)\n", SYS_socket_subcall + SC_listen);

There is only one personality in the test.
In the tracer it would be easier just to save the original scno.

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