21 Mar 2001 Robert Collins <rbtcollins@hotmail.com>
	* libc/include/sys/signal.h: Test for __CYGWIN__ as well as
	  _POSIX_THREADS
	* libc/include/sys/types.h:
	  Allow __CYGWIN__ for the POSIX_THREADS types.
	  Include <cygwin/types.h> rather than use the _POSIX_THREADS
	  structs from newlib.