Do not pass -dynamic-linker to linker when !shared.
Fixes <http://bugs.gnu.org/20102>.

ARM 'link' spec issue reported at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65711 and
https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01387.html.

Patch by Ludovic Courtès <ludo@gnu.org>.

--- gcc-4.8.4/gcc/config/arm/linux-elf.h.orig	2015-04-08 20:31:20.376900478 +0200
+++ gcc-4.8.4/gcc/config/arm/linux-elf.h	2015-04-08 20:31:36.437014437 +0200
@@ -65,7 +65,7 @@
    %{symbolic:-Bsymbolic} \
    %{!static: \
      %{rdynamic:-export-dynamic} \
-     -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
+     %{!shared:-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}} \
    -X \
    %{mbig-endian:-EB} %{mlittle-endian:-EL}" \
    SUBTARGET_EXTRA_LINK_SPEC
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<tr><td><span title='2020-03-23 18:46:40 +0100'>2020-03-23</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=f9b6f75d1c387acbedfb27962d5dbd34bc3c1492'>installer: Fix cow-store umount issue.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-03-05 23:40:24 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=64704be417ab6f2788e8e3bc36fede1db35470e7'>installer: Fix cow-store umount.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-03-05 23:40:23 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=e458726ab47a3748d80eb69c3c2545b414a73836'>installer: Honor /tmp/installer-system-init-options.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-05 23:40:23 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=8a4b11c6a911effddf4cac4b33f5c3c70392b797'>installer: Run commands without hopping through the shell.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-02-12 10:49:48 +0100'>2020-02-12</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=1d02052067e04d7dd8fd1ec17557ca02a30b9bcf'>installer: Remove the cow-store overlay after system installation.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-12-29 18:24:55 +0100'>2019-12-29</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=a4ee6ac444ca71a93101b48bc1e6a5710026266c'>installer: Pass '--fallback' to 'guix system init'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-28 22:57:07 +0200'>2019-04-28</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=0e8e963d73e61c7666f9ec4efa98c1a277c72af9'>installer: User accounts can now have a "real name."</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-26 14:19:36 +0200'>2019-04-26</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=9529f7850e3ae91cce70620e684fc6d0dc25e815'>installer: Take 'guix system init' exit code into account.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-25 00:45:35 +0200'>2019-04-25</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=91a7c4998fe4f5a2a63f2ddb4bfeeef81c68b6d7'>installer: Ask for the root account password.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-25 00:45:34 +0200'>2019-04-25</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=898677ed17672130d20434cd88575d620c97c553'>installer: Ask for user password and initialize /etc/shadow.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-23 00:34:47 +0200'>2019-04-23</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=7611074f677f1c3cfe5da426f387eeda1b6ad825'>installer: Run 'guix system init' with the right locale.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-17 14:04:22 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer/final.scm?id=dc5f3275ecbddc804875899e9e457299a835d7ab'>installer: Add configuration formatter.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>