Pthread support in cygwin

[Robert Collins]

This patch and attached changelog (my mailer stuffs up the formatting)
are a resubmission of the previosuly discussed patches for pthreads &
cygwin in newlib. I will look into a larger rearrangement as
discussed... but that will be much later. I won't shed any tears if the
rtems folk get there first :]

This patch is self-contained: committing it now should not cause any
problems with the existing pthread support in cygwin. (However I haven't
tried to mix and match so...)

==
2001-04-12  Robert Collins <rbtcollins@hotmail.com>

 * libc/include/sys/features.h: Add appropriate defines for Cygwin
pthread support.
 * libc/include/sys/signal.h: Remove unneeded __CYGWIN__ protection.
 * libc/include/sys/types.h: Protect __CYGWIN__ from the rtems pthreads
types.
 Include <cygwin/types.h> for the cygwin specific typedefs.


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2001-04-12  Robert Collins <rbtcollins@hotmail.com>

	* libc/include/sys/features.h: Add appropriate defines for Cygwin pthread support.
	* libc/include/sys/signal.h: Remove unneeded __CYGWIN__ protection.
	* libc/include/sys/types.h: Protect __CYGWIN__ from the rtems pthreads types.
	Include <cygwin/types.h> for the cygwin specific typedefs.
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