lib: remove obsolete deletion of bufferBinding.zeroFill

Author: legendecas

lib/internal/bootstrap/node.js

@@ -375,7 +375,6 @@ function setupBuffer() {
   // Only after this point can C++ use Buffer::New()
   bufferBinding.setBufferPrototype(Buffer.prototype);
   delete bufferBinding.setBufferPrototype;
-  delete bufferBinding.zeroFill;
 
   // Create global.Buffer as getters so that we have a
   // deprecation path for these in ES Modules.