execSync not allow encoding to set explicitly to buffer

Version: Tested on 5, 6
Platform: Tested on OS X, Ubuntu
Subsystem:

> child_process.execSync("ls",{encoding:"buffer"})
TypeError: Unknown encoding: buffer

Verified the issue.

One fix is cjihrig@ffb370f. Another fix would be supporting 'buffer' encoding in Buffer.prototype.toString().

EDIT: I'm not sure if the toString() approach makes sense though, as it would be giving back a Buffer, not a string.

child_process: allow buffer encoding in spawnSync

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