Remove an ugly hack in the client certificate verification code that works

Remove an ugly hack in the client certificate verification code that works
around broken GOST implementations.  It looks like client certificates with
GOST have been completely broken since reimport of the GOST code, so no-one
is using LibreSSL this way.  The client side was fixed only last week for
TLSv1.0 and TLSv1.1.  This workaround is now in the way of much needed
simplifcation and cleanup, so it is time for it to go.

suggested by and ok jsing