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-5.1.0/libvtv/Makefile.in	2014-10-30 09:28:58.000000000 +0100
+++ gcc-5.1.0/libvtv/Makefile.in	2015-04-30 09:51:04.161129705 +0200
@@ -15,6 +15,7 @@
 
 @SET_MAKE@
 
+libvtv_la_LDFLAGS = -Wl,-rpath=$(libdir)
 
 VPATH = @srcdir@
 pkgdatadir = $(datadir)/@PACKAGE@
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<tr><td><span title='2015-03-10 12:51:35 +0800'>2015-03-10</span></td><td><a href='/guix/commit/gnu/packages/ratpoison.scm?id=a79112079e7f233f24a5cb09e03bbfff6e8b9a9b'>gnu: ratpoison: Install xsession file (ratpoison.desktop).</a><span class='msg-avail'>...</span></td><td>宋文武</td></tr>
<tr><td><span title='2014-09-13 15:50:30 +0200'>2014-09-13</span></td><td><a href='/guix/commit/gnu/packages/ratpoison.scm?id=9e771e3bb67361b509a6d4e9c00b9d21d7f9b123'>gnu: Adjust synopses as recommended by 'guix lint'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-02-16 16:39:37 -0500'>2014-02-16</span></td><td><a href='/guix/commit/gnu/packages/ratpoison.scm?id=445c5abad8032f000387f36cc0533556289e5175'>gnu: ratpoison: Patch to use $SHELL instead of /bin/sh.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2013-12-15 22:31:19 +0100'>2013-12-15</span></td><td><a href='/guix/commit/gnu/packages/ratpoison.scm?id=c4c4cc05979f2a2d0212963c5fe1b940d63a0958'>gnu: Move numerous "inputs" which should be "native-inputs".</a><span class='msg-avail'>...</span></td><td>John Darrington</td></tr>