Fix mcontext_t sigcontext namespace (bug 21457)

[Florian Weimer]

On 06/27/2017 05:27 PM, Szabolcs Nagy wrote:

>> For some previous patches in this series, changing stack_t and ucontext_t, 
>> Florian checked there were no affected mangled names in Fedora, as 
>> evidence for such problems being rare.  Such a check might be worthwhile 
>> here (remembering that what is being looked for is architecture-specific, 
>> but on x86_64 / x86 the mangled name is already mcontext_t and would not 
>> change because there aren't namespace issues there).
>>
> 
> Florian, if you can check, then please do.

What's the old mangled name I would have to look for?  sigcontext?

Thanks,
Florian