try to simplify internal library dependency.
Just use the lib/name/libname.la as libtool should be responsible to emit dependencies to compiler when it evaluates.
This should reduce over-linking, also reducing the compile lines in our verbose builds ;-)
NOTE: this seems to work on Fedora 18 (which also bitch about DSO), so hopefully works on Debian and Ubuntu (and elsewhere).
Please revert if breaks builds!