Set SSL_CERT_FILE shell environment variable accordingly. For example, for Bourne-like shell (bash, ksh)
SSL_CERT_FILE=/usr/pkg/etc/openssl/root-certs/ca-certificates.crt export SSL_CERT_FILE
There is a parameter called shortmess. It's responsible for inhibiting various Vim messages. To disable startup message one has to append I to the value of shortmess.