This fixes linking libfstest/test-fcntl (and others).

As discussed with upstream: https://lists.gnu.org/archive/html/bug-hurd/2020-03/msg00018.html

From 96a9f67a8685e713f25259c18306797d54cc27a5 Mon Sep 17 00:00:00 2001
From: Jan Nieuwenhuizen <janneke@gnu.org>
Date: Sat, 14 Mar 2020 11:28:31 +0100
Subject: [PATCH] build: Fix cross build on Guix.

As discussed in https://lists.gnu.org/archive/html/bug-hurd/2020-03/msg00018.html.

* Makeconf (lpath): Add -Wl,-rpath-link=<dir> next to -L<dir>.
---
 Makeconf | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makeconf b/Makeconf
index 67f7ab1c..f68ff6e3 100644
--- a/Makeconf
+++ b/Makeconf
@@ -325,7 +325,8 @@ _libsubst=${libsubst$(patsubst %,-override,${libsubst-override})}
 
 # Direct the linker where to find shared objects specified in the
 # dependencies of other shared objects it encounters.
-lpath := -L. $(patsubst %,-L%,$(dir $(wildcard ../lib*/lib*.so)))
+lib_dirs := $(dir $(wildcard ../lib*/lib*.so))
+lpath := -L. $(lib_dirs:%=-L%) $(lib_dirs:%=-Wl,-rpath-link=%)
 
 # Main rule to link executables
 #
-- 
2.24.0

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<div class='path'>path: <a href='/guix/log/?id=52995941bc4546002150a437f9f3e5022e6dcc86'>root</a>/<a href='/guix/log/nix?id=52995941bc4546002150a437f9f3e5022e6dcc86'>nix</a>/<a href='/guix/log/nix/scripts?id=52995941bc4546002150a437f9f3e5022e6dcc86'>scripts</a>/<a href='/guix/log/nix/scripts/list-runtime-roots.in?id=52995941bc4546002150a437f9f3e5022e6dcc86'>list-runtime-roots.in</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/nix/scripts/list-runtime-roots.in?id=52995941bc4546002150a437f9f3e5022e6dcc86&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-03-08 23:42:53 +0100'>2017-03-08</span></td><td><a href='/guix/commit/nix/scripts/list-runtime-roots.in?id=ac9c1dc7bdf1a016fcd1989993999e4a32d0c885'>list-runtime-roots: Bufferize the lsof pipe.</a><span class='msg-avail'>...<span class='msg-tooltip'>* nix/scripts/list-runtime-roots.in (lsof-roots): Add 'setvbuf' call for
PIPE.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-05-16 10:20:45 +0200'>2014-05-16</span></td><td><a href='/guix/commit/nix/scripts/list-runtime-roots.in?id=d0281fec03d93a44f7abaa270a3f7417b8e14627'>list-runtime-roots: Don't display a backtrace on 2.0.5 when lsof is lacking.</a><span class='msg-avail'>...<span class='msg-tooltip'>* nix/scripts/list-runtime-roots.in (lsof-roots): Fix typo in 'catch'
  tag.  Add 'parent' variable.  Wrap 'open-pipe*' call in 'catch'.
  Reported by Andreas Enge &lt;andreas@enge.fr&gt;.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-10-29 00:08:44 +0100'>2013-10-29</span></td><td><a href='/guix/commit/nix/scripts/list-runtime-roots.in?id=cb558fcd9c3818c20232305630acd6a18039318b'>list-runtime-roots: List files referenced by environment variables.</a><span class='msg-avail'>...<span class='msg-tooltip'>Inspired by &lt;https://github.com/NixOS/nix/compare/772b70952f75...4ddd077bfa9a&gt;.

* nix/scripts/list-runtime-roots.in (%store-directory): New variable.
  (proc-environ-roots): New procedure.
  (&lt;top-level&gt;): Use it.
</span></span></td><td>Ludovic Courtès</td></tr>