lib: remove internalBinding('config').pendingDeprecation

Instead use
`require('internal/options').getOptionValue('--pending-deprecation')`

PR-URL: https://github.com/nodejs/node/pull/24962
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/buffer.js

@@ -48,9 +48,7 @@ const {
   isArrayBufferView,
   isUint8Array
 } = require('internal/util/types');
-const {
-  pendingDeprecation
-} = internalBinding('config');
+
 const {
   ERR_BUFFER_OUT_OF_BOUNDS,
   ERR_OUT_OF_RANGE,
@@ -138,7 +136,7 @@ const bufferWarning = 'Buffer() is deprecated due to security and usability ' +
 function showFlaggedDeprecation() {
   if (bufferWarningAlreadyEmitted ||
       ++nodeModulesCheckCounter > 10000 ||
-      (!pendingDeprecation &&
+      (!require('internal/options').getOptionValue('--pending-deprecation') &&
        isInsideNodeModules())) {
     // We don't emit a warning, because we either:
     // - Already did so, or