Remove the FD_SETSIZE check.

This is a hold-over from using select() back in the past.
It now uses libevent, so it no longer (itself) cares about the size of
FD_SETSIZE.

httperf/src/core.c

@@ -689,13 +689,6 @@ core_init(void)
 		exit(1);
 	}
 
-	if (rlimit.rlim_max > FD_SETSIZE) {
-		fprintf(stderr, "%s: warning: open file limit > FD_SETSIZE; "
-			"limiting max. # of open files to FD_SETSIZE\n",
-			prog_name);
-		rlimit.rlim_max = FD_SETSIZE;
-	}
-
 	rlimit.rlim_cur = rlimit.rlim_max;
 	if (setrlimit(RLIMIT_NOFILE, &rlimit) < 0) {
 		fprintf(stderr,