crypto: Refactor nif code to use EVP interface

Using the generic EVP_* API makes it possible to unify
algorithm-specific nif functions to a single generic
function. Effectively the same change that took place on the Erlang
API in R16B01 is now applied to the C code.

The old implementation using the low-level API is kept
for compiling against old OpenSSL,
as parts of the EVP API were introduced in OpenSSL 1.0.0.

There are various minor improvements as well:
- supported algorithms are now provided by the nif code (not a mix of
  the C and Erlang code)
- remove unnecessary variables and macro definitions

Most of the changes in this commit comes from Dániel Szoboszlay
https://github.com/dszoboszlay/otp/commit/07f7056f955b324df4ace
which is part of his 'fips' branch.

Now also rebased on master branch.

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