* ltmain.in: Remove the code for stripping duplicate deplibs
from libtool link lines -- duplicates are somtimes necessary
to satisfy inter-library dependencies, and never cause link to
fail even if they are spurious.
* tests/depdemo-dups.test: New file.  Make sure this bug doesn't
creep back in again!
* tests/Makefile.am (TESTS): Use the new test above.