Add generic EVP method fetcher

This is an interface between Core dispatch table fetching and
EVP_{method}_fetch().  All that's needed from the diverse method
fetchers are the functions to create a method structure from a
dispatch table, a function that ups the method reference counter and a
function to free the method (in case of failure).

This routine is internal to the EVP API andis therefore only made
accessible within crypto/evp, by including evp_locl.h

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8341)

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