libtool does not recognize lib64 -- Update to Olly Betts' patch

[Toshio Kuratomi]

Greetings.  I package software for Fedora and frequently get hit with
/usr/lib64 being added as an rpath in builds.  I found what I think is the
last thread on this subject here:
  http://lists.gnu.org/archive/html/libtool-patches/2010-06/msg00141.html

In the second message, Olly Betts links to a message from 2007 where he
proposed a patch that would solve this by parsing the output of
/sbin/ldconfig rather than trying to parse /etc/ld.so.conf.  The thread
ended with a positive view of the patch and a request to update the patch
for current libtool.  This last step doesn't appear to have happened.

Since I care about this issue, I've gone ahead and ported the patch to
current git master.  I'm attaching it here.

Thanks,
-Toshio

0001-Update-Olly-Betts-patch-to-use-sbin-ldconfig-to-find.patch
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