In parellel builds, this should allow sqlite to start building earlier and
increase parallelism when building lib/. Looking at htop output during
buildworld/tinderbox, there are long phases where only one CPU is active
optimizing the massive sqlite3.c file since the build of libsqlite3 is
started quite late.
It appears that bmake currently processes dependencies in order, but if
there is a way to force certain ones to be started first that would be less
fragile than this current approach.