signal.c: Change printsignal to properly handle xlat styles

[shankarapailoor]

Hi!

I noticed that strace doesn't properly decode the signum of sigaction
system calls under different xlat styles. Attached is a patch which
corrects this issue. I will follow this up with another patch to
change the decoding of sa_mask field to properly handle xlat styles.
Let me know what you think.

Regards,
Shankara Pailoor
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