that's not a fix, just a proposal.
i modified a little your Android.mk makefile to let users able to build a static db-6.0 library, thus to use it in their own C projects.
give a look to my commits over the 0.6.30 version here: https://github.com/tux-mind/platform_external_bdb/commits/master
thanks for your attention.
We will take a look.