Current glibc-2-1-branch linuxthreads/signals.c doesn't compile

[Ulrich Drepper]

Joel Klecker <jk@espy.org> writes:

> linuxthreads/signals.c doesn't appear to need any of the functions
> prototyped in <ucontext.h>, so I believe this is the correct fix.

I prefer to have the real heade included and so I make the same change
as for 2.2 (where I fixed this already some time ago).

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