GCC 4.9 and later have libvtv and, just like libstdc++ (see
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32354), it doesn't
have $libdir in its RUNPATH, but it NEEDs libgcc_s.  This patch
fixes that.

--- gcc-4.9.2/libvtv/Makefile.in	2014-10-30 09:28:58.000000000 +0100
+++ gcc-4.9.2/libvtv/Makefile.in	2015-04-30 09:51:04.161129705 +0200
@@ -15,6 +15,7 @@
 
 @SET_MAKE@
 
+AM_LDFLAGS = -Wl,-rpath=$(libdir)
 
 VPATH = @srcdir@
 pkgdatadir = $(datadir)/@PACKAGE@
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<tr><td><span title='2019-07-19 11:53:47 +0200'>2019-07-19</span></td><td><a href='/guix/commit/tests/containers.scm?id=bacfec8611530dc3e849fb804b51f50b299796f0'>linux-container: Add 'eval/container'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-02 18:15:37 +0200'>2019-04-02</span></td><td><a href='/guix/commit/tests/containers.scm?id=af76c020bf19de5fe2e92f31d8b85cbd55c481de'>linux-container: Make the guest UID and GID a parameter.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-05-31 17:08:45 +0200'>2017-05-31</span></td><td><a href='/guix/commit/tests/containers.scm?id=3e894917414239cab1737d89feb263e0825ae7c5'>tests: Fix race condition in 'container-excursion*' test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-02-07 00:08:10 +0100'>2017-02-07</span></td><td><a href='/guix/commit/tests/containers.scm?id=c90db25f4cf1f98f3f4f3af38d175a14ffb8c32a'>linux-container: Add 'container-excursion*'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-11-13 13:04:00 +0100'>2016-11-13</span></td><td><a href='/guix/commit/tests/containers.scm?id=a24b56fa8d64d9c6b8348c439cc988dbcebc911f'>tests: Don't check file-systems in container tests.</a><span class='msg-avail'>...</span></td><td>Andy Patterson</td></tr>
<tr><td><span title='2016-11-10 18:01:44 +0100'>2016-11-10</span></td><td><a href='/guix/commit/tests/containers.scm?id=5970e8e248f6327c41c83b86bb2c89be7c3b1b4e'>container: Pass a list of &lt;file-system&gt; objects as things to mount.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-10-19 15:54:10 +0200'>2016-10-19</span></td><td><a href='/guix/commit/tests/containers.scm?id=7fee5b53973fb4fe049aa0bc5db58093727bdf30'>container: Allow 'container-excursion' to the same namespaces.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-06-25 01:13:23 +0200'>2016-06-25</span></td><td><a href='/guix/commit/tests/containers.scm?id=25a3bfbe77cb45aa26f9af8c72e7f978a177187e'>tests: Skip all the container tests when needed.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-05-31 00:11:04 +0200'>2016-05-31</span></td><td><a href='/guix/commit/tests/containers.scm?id=c06f6db7a424fd47e3cd2625dbfda2367316f3bd'>container: Gracefully report mount errors in the child process.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-04-03 14:19:09 +0200'>2016-04-03</span></td><td><a href='/guix/commit/tests/containers.scm?id=a9edb211e733b8b34e67ec3b4450567e9376986f'>build: Add a Guile custom test driver using SRFI-64.</a><span class='msg-avail'>...</span></td><td>Mathieu Lirzin</td></tr>
<tr><td><span title='2015-11-03 11:41:04 -0500'>2015-11-03</span></td><td><a href='/guix/commit/tests/containers.scm?id=b7d48312bbfc7bdbb3895eb10edc352eeb555b98'>build: container: Add feature test predicates.</a><span class='msg-avail'>...</span></td><td>David Thompson</td></tr>