Remove misuse warnings for EVP_*Final()

Remove misuse warnings for EVP_*Final()

They make no sense. These are thin wrappers of EVP_*Final_ex() and behave
exactly the same way. The minor behavior difference of Init and Init_ex is
likely a historical artefact of this abomination of an API. Deprecation of
the Init functions was recently removed from the manpage. The only reason
to prefer the _ex versions over the normal versions is ENGINE. This is no
longer an argument.

The warnings were added in an attempt at adding automatic cleanup.  This
broke stuff and was therefore backed out. The warnings remained.

discussed with schwarze