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

[Dmitry V. Levin]

```
$ env -i ./strace -n -v -e/execve,/exit tests-m32/strace-n > /dev/null
[  59] execve("tests-m32/strace-n", ["tests-m32/strace-n"], []) = 0
[  59] [ Process PID=12345 runs in 32 bit mode. ]
[ 252] exit_group(0)                    = ?
[ 252] +++ exited with 0 +++
```
Is this behaviour of the new -n option expected?

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