* Add a db1.builtin.mk file that detects whether DB-1.85 functionality
exists in the base system, and remove the distinction between
"native" and the other Berkeley DB packages -- we now refer to
db[1234]. This paves the way for any future databases/db1 package.
* USE_DB185 shouldn't need to be set by any packages -- its correct
value is now automatically determined by bdb.buildlink3.mk depending
on whether we explicitly request db1 or not. By default, if you
include bdb.buildlink3.mk, you want DB-1.85 functionality and
USE_DB185 defaults to "yes", but if you explicitly remove db1 from
the list of acceptable DBs, then USE_DB185 defaults to "no".
* Set BDB_LIBS to the library options needed to link against the DB
library when bdb.buildlink3.mk is included.
* We only add the DB library to the linker command automatically if
we want DB-1.85 functionality; otherwise assume that the package
configure process can figure out how to probe for the correct
headers and libraries.
Edit package Makefiles to nuke redundant settings of USE_DB185.
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