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='2019-05-18 12:10:15 +0200'>2019-05-18</span></td><td><a href='/guix/commit/tests/gremlin.scm?id=6b97415996583b15a97dad8254f610275353e913'>gremlin: Adjust tests for foreign distros.</a><span class='msg-avail'>...</span></td><td>Ting-Wei Lan</td></tr>
<tr><td><span title='2018-08-25 16:44:07 +0200'>2018-08-25</span></td><td><a href='/guix/commit/tests/gremlin.scm?id=839167ff9d74fc490b32f6a197591964f73b65e5'>Merge branch 'staging' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-08-21 23:27:08 +0200'>2018-08-21</span></td><td><a href='/guix/commit/tests/gremlin.scm?id=f7dfda2c73a0c4f09b105cafb29c45cf594e4ba9'>gremlin: 'elf-dynamic-info-needed' test is no longer skipped.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-07 11:21:36 +0200'>2018-05-07</span></td><td><a href='/guix/commit/tests/gremlin.scm?id=b178fc236908ad2da86734ea8e01abd3ff8981da'>gremlin: Add 'strip-runpath'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>