ucontext_t is not available from signal.h

[Václav Haisman]

Hi.

I have just noticed, while porting my stuff from Linux to Cygwin, that
signal.h does not provide `ucontext_t`. It should be available from
signal.h. From <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html>:

> The ucontext_t and mcontext_t structures are added here from the obsolescent <ucontext.h> header.

-- 
VH

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