[openssl-project] Style guide updates

[Salz, Rich]

And also
	https://github.com/openssl/web/pull/42


On 1/26/18, 1:11 PM, "Andy Polyakov" <appro at openssl.org> wrote:

    > What else needs to be updated?
    
    Relax requirement that argument names in function definition has to
    match function declaration to permit adding 'unused_' prefix prior
    unused arguments.
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