[strace/strace] printsiginfo: decode si_pkey field (PR #210)

[Slava]

Hey, I've replaced:

```
if (*p)
    __asm__ volatile("":::"memory");
```

with 

```
__asm__ volatile("":: "r" (*p));
```

which is IMHO a bit simpler and generates a single `mov` instruction (in x86 assembly), unlike trick with if (which produces 2 instructions).

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