lib: remove deprecated node:sys module

Author: anonrig

doc/api/deprecations.md

@@ -585,6 +585,9 @@ The `REPLServer.prototype.convertToContext()` API has been removed.
 
 <!-- YAML
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/49520
+    description: End-of-Life.
   - version:
     - v6.12.0
     - v4.8.6
@@ -595,9 +598,10 @@ changes:
     description: Runtime deprecation.
 -->
 
-Type: Runtime
+Type: End-of-Life
 
-The `node:sys` module is deprecated. Please use the [`util`][] module instead.
+The `node:sys` module has been removed. Please use the [`util`][]
+module instead.
 
 ### DEP0026: `util.print()`
 

lib/sys.js

@@ -1,5 +1,5 @@
 'use strict';
-require('sys');  // Builtin should not show up in module.children array.
+require('http');  // Builtin should not show up in module.children array.
 require('./b');  // This should.
 require('./b');  // This should not.
 module.exports = module.children.slice();

test/fixtures/GH-7131/a.js

@@ -5,7 +5,6 @@ const { builtinModules } = require('module');
 
 // Includes modules in lib/ (even deprecated ones)
 assert(builtinModules.includes('http'));
-assert(builtinModules.includes('sys'));
 
 // Does not include internal modules
 assert.deepStrictEqual(

test/parallel/test-module-builtin.js

@@ -5,7 +5,6 @@ const { isBuiltin } = require('module');
 
 // Includes modules in lib/ (even deprecated ones)
 assert(isBuiltin('http'));
-assert(isBuiltin('sys'));
 assert(isBuiltin('node:fs'));
 assert(isBuiltin('node:test'));
 

test/parallel/test-module-isBuiltin.js

@@ -81,7 +81,6 @@
       "stream": ["./lib/stream.js"],
       "stream/promises": ["./lib/stream/promises.js"],
       "string_decoder": ["./lib/string_decoder.js"],
-      "sys": ["./lib/sys.js"],
       "timers": ["./lib/timers.js"],
       "timers/promises": ["./lib/timers/promises.js"],
       "tls": ["./lib/tls.js"],