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='2020-03-21 16:20:11 +0100'>2020-03-21</span></td><td><a href='/guix/commit/gnu/packages/opencl.scm?id=c6be7eeddf3a98ab354826f8b33d402e0548a3e0'>gnu: opencl-clhpp: Use HTTPS home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-02-26 21:52:46 +0100'>2020-02-26</span></td><td><a href='/guix/commit/gnu/packages/opencl.scm?id=6fda3a6cb421121d6ff600b9bc836e24c18a433a'>gnu: pocl: Build with LLVM@9.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-02-10 23:31:59 +0100'>2020-02-10</span></td><td><a href='/guix/commit/gnu/packages/opencl.scm?id=01dce79fa400e7e41024567c9fc7614b0cf8eddf'>gnu: Add python-pyopencl.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-02-10 23:31:58 +0100'>2020-02-10</span></td><td><a href='/guix/commit/gnu/packages/opencl.scm?id=3f1a0f1684538466d4a157d7a39fca205a3be196'>gnu: Add python-pytools.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-11-15 17:52:45 +0100'>2019-11-15</span></td><td><a href='/guix/commit/gnu/packages/opencl.scm?id=8c8e108978e0917415c863977b605b84dd01be52'>gnu: hwloc: Update to 2.1.0.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-10-31 01:03:27 +0100'>2019-10-31</span></td><td><a href='/guix/commit/gnu/packages/opencl.scm?id=bbad38f4d8e6b6ecc15c476b973094cdf96cdeae'>gnu: pocl: Update to 1.4.</a><span class='msg-avail'>...</span></td><td>Ivan Gankevich</td></tr>