* No more FUNCS/MACROS distinction

* change the docs to not talk about MACROS since they're gone

* remove out of date comment

>>> lib.EVP_get_digestbyname(b'md_gost94')
<cdata 'EVP_MD *' NULL>
>>> lib.OPENSSL_config(ffi.NULL)
>>> lib.EVP_get_digestbyname(b'md_gost94')
<cdata 'EVP_MD *' 0x10adc7440>

OPENSSL_config is deprecated in 1.1.0 and OPENSSL_no_config is a macro
provided solely for compatibility. We don't use either of these and the
only thing we actually need is an opaque typedef for CONF.