deischen d948dbd9bc Use struct __ucontext in prototypes and associated functions instead of
ucontext_t.  Forward declare struct __ucontext in <sys/signal.h> and
remove reliance on <sys/ucontext.h> being included.

While I'm here, also hide osigcontext types from userland; suggested
by bde.

Namespace pollution noticed by: Kevin Day <toasty@shell.dragondata.com>
2002-02-17 17:40:34 +00:00
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