[strace/strace] [RFC] Add 64-bit LoongArch support (PR #205)

[Dmitry V. Levin]

> > In other words, all tests based on syscall tampering are failing there.
> > Assuming that src/linux/loongarch64/set_scno.c and src/linux/loongarch64/set_error.c are correct, the kernel seems to be missing syscall tampering support.
> 
> Okay... this is the same result I've been seeing all the time (and exactly why I haven't pushed the `xlat` changes recently).
> 
> It indeed seems ptrace functionality is missing, judging from [the latest kernel source](https://github.com/loongson/linux/blob/78d3641f1f61866cc5ec7460af65d2530c17a202/arch/loongarch/kernel/ptrace.c). Syscall tracing machinery cannot be seen. Maybe @chenhuacai could implement this in next revision of loongarch-next series?

There is _some_ support for changing the syscall nr in [do_syscall](https://github.com/loongson/linux/blob/loongarch-next/arch/loongarch/kernel/syscall.c#L40), but, apparently, it doesn't work as expected.

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