[commit] Add PTRACE_GETTRACESIG handling in ptrace_request_to_str

[Joel Brobecker]

> "break" is unreachable after "return".

Yeah - it's a bad habit of mine to consider "break;" as a syntactic
element of the case. 

> We could also get rid of the risk of typoing
> the string with something like:
> 
> #define CASE(X) case X: return #X
>   switch (request)
>     {
>       CASE(PTRACE_TRACEME);
>       CASE(PTRACE_PEEKTEXT);
> ...
>     }
> #undef CASE

Indeed. Suggestion applied thusly, after having been tested
on ppc-lynx178 (with and without debug enabled).

gdb/gdbserver/ChangeLog:

        * lynx-low.c (ptrace_request_to_str): Define a temporary
        macro and use it to simplify this function's implementation.

Thanks!
-- 
Joel
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