[Buildroot] Analysis of build failures

[Waldemar Brodkorb]

Hi Thomas,
Thomas Petazzoni wrote,

> >          arm |                libsigsegv-2.10 | NOK | http://autobuild.buildroot.net/results/a144bc6024415a5272c3cbe60ff636d078d0a555/
> >          arm |                libsigsegv-2.10 | NOK | http://autobuild.buildroot.net/results/00195d89a115a314bf4916af127407f61cd1b418/
> 
> error: unknown type name 'ucontext_t'
> 
> Happens with uClibc-ng only it seems. Waldemar, can you have a look?

Patch sent. A symbol in the config is required to enable these
needed SuSv3 functions. Fixes also the mongrel2 compile errors.

best regards
 Waldemar