Update freebsd-12 base image
Update freebsd-12 base image

As freebsd-12 is currently the development version of freebsd,
keeping the base image in sync with the binary packages we
install is essential.

Change-Id: Idf53d3f5865382068704ec26170ad2c4f749c856

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration