library expands until it has its own dlfcn wrapper, and libcrypto is no
exception.
Remove the non-dlfcn DSO methods.
This causes public DSO_METHOD_{beos,dl,vms,win32} to disappear (major bump
coming soon). Note that portable software ought to use DSO_METHOD_openssl
instead of picking the backend directly (which makes one wonder why the
backends are exposed, as it is unlikely that more than one can work on
your system).
ok beck@ deraadt@