* dtable.cc: Guard against new winsock.h/winsock2.h warnings when mixing

winsock*.h and sys/types.h.
* fhandler_socket.cc: Ditto.
* net.cc: Ditto.
* select.cc: Ditto.
* exceptions.cc: Remove unneeded define.

winsup/cygwin/exceptions.cc

@@ -8,7 +8,6 @@ This software is a copyrighted work licensed under the terms of the
 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
-#define Win32_Winsock
 #include "winsup.h"
 #include <imagehlp.h>
 #include <errno.h>