Fixes #3597: Move hwloc dependency_lib fix to v1.7

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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.
Fixes #3592: btl_openib: change SRQ defaults

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r28440 [[BR]]
* btl_openib: changed default SRQ settings:
  * increase number of wqe to minimize number of RNRs
  * it is better to have high watermark and post relatively small number of wqes
  * increased TX queue size

r28441 [[BR]]
* correction of r28440