Strip postgresql code out of bsd.database.mk, and introduce USES=pgsql.
# Depend on postgresql-client
# Depend on postgresql-client at least 9.2
#Depend on postgresql-server at least 9.0
Postgresql now supports DEFAULT_VERSIONS, and please note that the
version syntax now includes dots(!); i.e. before it was 90, now 9.0
Reviewed by: ade, silence from pgsql@