hwloc: Update internal hwloc to v2.7.0.

This is the latest, released Dec 13, 2021.

https://www.open-mpi.org/software/hwloc/v2.7/

Signed-off-by: Austen Lauria <awlauria@us.ibm.com>
(cherry picked from commit 0237ec1)

Author: awlauria

3rd-party/hwloc-2.4.0.tar.gz

@@ -77,7 +77,7 @@
 
 # version of packages we ship as tarballs
 my $libevent_version="2.1.12-stable";
-my $hwloc_version="2.4.0";
+my $hwloc_version="2.7.0";
 
 # One-time setup
 my $username;