openssl: Don't manually seed DRBG with OpenSSL 1.1.1

openssl: Don't manually seed DRBG with OpenSSL 1.1.1

According to the documentation, it's generally not necessary to manually
seed OpenSSL's DRBG (and it actually can cause the daemon to lock up
during start up on systems with low entropy if OpenSSL is already trying
to seed it itself and holds the lock).  While that might already have been
the case with earlier versions, it's not explicitly stated in their
documentation.  So we keep the code for these versions.