* select.h (select_stuff::select_stuff): Make default constructor always zero

everything while constructor with int arg just zeroes next.
* select.cc (select_stuff::test_and_set): Revert to using default constructor.

winsup/cygwin/select.cc

@@ -295,7 +295,7 @@ select_stuff::test_and_set (int i, fd_set *readfds, fd_set *writefds,
       && ! UNIX_FD_ISSET (i, exceptfds))
     return true;
 
-  select_record *s = new select_record (0);
+  select_record *s = new select_record;
   if (!s)
     return false;