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='2021-09-26 23:20:56 +0200'>2021-09-26</span></td><td><a href='/guix/commit/gnu/tests/security-token.scm?id=89b05442933d92f4b21c3294455a498e8333727d'>tests: Reduce boilerplate for users of 'system-test-runner'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-09-25 18:52:05 +0200'>2021-09-25</span></td><td><a href='/guix/commit/gnu/tests/security-token.scm?id=1fb75128a5202b406622da6272bc809c46d1f439'>tests: Adjust to SRFI-64 as found in Guile 3.0.7.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>