* select.cc (thread_pipe): Add paranoid check to ensure thread termination.

* external.cc: Eliminate obsolete include.
* getopt.c (getopt_long): Fix compiler warning.
* shared.h: Moved PID_ definitions to include/sys/cygwin so that they can be
used by external programs.
* include/sys/cygwin.h: Move external definitions here.  Include sys/resource.h
to avoid having to do this everywhere.

winsup/cygwin/select.cc

@@ -505,6 +505,12 @@ thread_pipe (void *arg)
 		goto out;
 	      }
 	  }
+      /* Paranoid check */
+      if (pi->stop_thread_pipe)
+	{
+	  select_printf ("stopping from outer loop");
+	  break;
+	}
       if (gotone)
 	break;
       Sleep (10);