security/tpm2-tools: fix build if security/openssl is installed

If someone has DEFAULT_VERSIONS=ssl:openssl it will now check the lib in
/usr/local during configure. Similarly if using
DEFAULT_VERSIONS=ssl:base, it looks in /usr/lib during configure.

PR: 274013
Approved by: tstruk@gmail.com (maintainer)
MFH: 2023Q4