pthread_kill prototype

[Christopher Faylor]

On Wed, Mar 21, 2001 at 12:20:24PM +1100, Robert Collins wrote:
>> actually this is only a problem when
>> #if defined(_POSIX_THREADS) 
>> 
>> which I do not believe is defined anywhere in Cygwin
>> so may never have beem picked up before

Someone asked recently if this should be done.  Since I don't
know much about pthreads, I didn't know how to respond.

If it makes sense to define _POSIX_PTHREADS (and it sounds like it does)
for Cygwin, I'll add that as a define for gcc 2.95.3.

cgf