Revert "Address a race condition in libevent select."

We do not want to be patching upstream components anymore.
The proper method is to get this merged upstream, then
pull it in the next upstream release.

This reverts commit c39fb57.

opal/mca/event/libevent2022/libevent/select.c

@@ -42,7 +42,6 @@
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
-#include <fcntl.h>
 
 #include "event-internal.h"
 #include "evsignal-internal.h"
@@ -167,30 +166,12 @@ select_dispatch(struct event_base *base, struct timeval *tv)
 	check_selectop(sop);
 
 	if (res == -1) {
-		if (errno == EINTR) {
-		        return (0);
+		if (errno != EINTR) {
+			event_warn("select");
+			return (-1);
 		}
-                /* There seems to be a very subtle race condition between the
-                 * event_del and the select, where the fd is still active on the
-                 * event_readset_in but no libevent structure make reference
-                 * to it so it. Thus, any call to progress will no nothing more
-                 * than print a warning and do nothing, leading to deadlocks.
-                 * If we force remove the problematic fd, we get the warning only
-                 * once, and things work as expected.
-                 */
-		event_warn("select");
-	        for (j = 0; j < nfds; ++j) {
-		    if (FD_ISSET(j, sop->event_readset_in) ||
-		        FD_ISSET(j, sop->event_writeset_in)) {
-                        res = fcntl(j, F_GETFL);
-                        if( res == -1 ) {
-                            event_warn("bad file descriptor %d/%d\n", j, nfds);
-                            FD_CLR(j, sop->event_readset_in);
-                            FD_CLR(j, sop->event_writeset_in);
-                        }
-                    }
-                }
-		return (-1);
+
+		return (0);
 	}
 
 	event_debug(("%s: select reports %d", __func__, res));