OpenSSL 1.1.1 libssl.so version number

Prior to the OpenSSL 1.1.1 import, the base OpenSSL library was
/usr/lib/libssl.so.8.  The security/openssl port (1.0.2p) installed
${LOCALBASE}/lib/ilbssl.so.9 and the security/openssl-devel port
(1.1.0i) installed ${LOCALBASE}/lib/libssl.so.11.  After the import, the
base OpenSSL library is /usr/lib/libssl.so.9.  Now if you build ports
with DEFAULT_VERSIONS+=ssl=openssl, the library that actually gets used
is ambiguous because there are now two different versions of libssl.so
(1.0.2p and 1.1.1) with the same shared library version number.

I stumbled across this when debugging a virtualbox-ose configure
failure.  The test executable was linked to the ports version of
libssl.so but rtld chose the base libssl.so at run time.