test: assume priv ports start at 1024 if it can't be changed

An update to test/parallel/test-cluster-bind-privileged-port.js
checks the lowest privileged port to ensure 42 is privileged
This only works on kernels > 4.1. On older kernels, this is
locked at 1024 so the check is not needed.

Fixes: #45838
PR-URL: #46536
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/parallel/test-cluster-bind-privileged-port.js

@@ -27,9 +27,14 @@ const net = require('net');
 const { readFileSync } = require('fs');
 
 if (common.isLinux) {
-  const unprivilegedPortStart = parseInt(readFileSync('/proc/sys/net/ipv4/ip_unprivileged_port_start'));
-  if (unprivilegedPortStart <= 42) {
-    common.skip('Port 42 is unprivileged');
+  try {
+    const unprivilegedPortStart = parseInt(readFileSync('/proc/sys/net/ipv4/ip_unprivileged_port_start'));
+    if (unprivilegedPortStart <= 42) {
+      common.skip('Port 42 is unprivileged');
+    }
+  } catch {
+    // Do nothing, feature doesn't exist, minimum is 1024 so 42 is usable.
+    // Continue...
   }
 }