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='2021-04-15 03:22:55 -0400'>2021-04-15</span></td><td><a href='/guix/commit/tests/grafts.scm?id=1bab9b9f17256a9e4f45f5b0cceb8b52e0a1b1ed'>grafts: Support rewriting UTF-16 and UTF-32 store references.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>