Fixes #3596: Move hwloc dependency_lib fix to v1.6

---svn-pre-commit-ignore-below---

Custom patch from ticket based on:

r28457 [[BR]]
Fix issue raised by Stefan Friedel: remove an extraneous -L that is
added by hwloc's embedding so that it doesn't appear in
libhwloc_embedded.la (and therefore propogate all the way up to
libmpi.la). 

Committed upstream in hwloc SVN r5588.

r28458 [[BR]]
Update the list of post-1.5.2 r numbers from hwloc that we have
committed here.