Drop unneeded reverseBuffer util method

[lukechilds]

In Node.js a Buffer is also a subclass of TypedArray so there's no need for a reverseBuffer util method, you can just use TypedArray.prototype.reverse() directly on a Buffer instance.

$ node
Welcome to Node.js v12.11.1.
Type ".help" for more information.
> buf = Buffer.from('Test')
<Buffer 54 65 73 74>
> buf.reverse()
<Buffer 74 73 65 54>

I haven't tested the PR because attempting to run tests or require local-index-wrapper.js just gives me Error: Cannot find module '../../keys/'.

I'm not really familiar with Dojo, I was just looking at how the importer wrappers were implemented and saw this.