Update to hwloc 2.4.0

Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>

Author: jjhursey

3rd-party/hwloc-2.2.0.tar.gz

@@ -77,7 +77,7 @@
 
 # version of packages we ship as tarballs
 my $libevent_version="2.1.12-stable";
-my $hwloc_version="2.2.0";
+my $hwloc_version="2.4.0";
 
 # One-time setup
 my $username;