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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<div class='path'>path: <a href='/guix/log/?id=5d419dbefce61645075b126c2f359953131de5a7'>root</a>/<a href='/guix/log/tests?id=5d419dbefce61645075b126c2f359953131de5a7'>tests</a>/<a href='/guix/log/tests/git.scm?id=5d419dbefce61645075b126c2f359953131de5a7'>git.scm</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/tests/git.scm?id=5d419dbefce61645075b126c2f359953131de5a7&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-06-09 00:34:52 +0200'>2020-06-09</span></td><td><a href='/guix/commit/tests/git.scm?id=72357e2170e88f73c11ff089f87a744cee8606ec'>git: 'commit-difference' really excludes the ancestors of #:excluded.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-25 00:00:28 +0200'>2020-05-25</span></td><td><a href='/guix/commit/tests/git.scm?id=c098c11be8eb9e0c12be42640721e3cb21c37628'>git: Add 'commit-relation'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-12-27 13:52:49 +0100'>2019-12-27</span></td><td><a href='/guix/commit/tests/git.scm?id=785af04a7574867dc940c791daa938a2432d0450'>git: 'commit-difference' takes a list of excluded commits.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-23 10:38:43 +0200'>2019-09-23</span></td><td><a href='/guix/commit/tests/git.scm?id=873f6f1334ab06a69e768a8aea0054404237542f'>git: Add 'commit-difference'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>