Fix a regression in glibc 2.27 when built without ldconfig.  See
<https://sourceware.org/bugzilla/show_bug.cgi?id=22977> for details.

diff --git a/include/libc-symbols.h b/include/libc-symbols.h
index 6137304b0b..7d630f36d8 100644
--- a/include/libc-symbols.h
+++ b/include/libc-symbols.h
@@ -508,7 +508,7 @@ for linking")
 # ifndef __ASSEMBLER__
 #  if !defined SHARED && IS_IN (libc) && !defined LIBC_NONSHARED \
       && (!defined PIC || !defined NO_HIDDEN_EXTERN_FUNC_IN_PIE) \
-      && !defined NO_HIDDEN
+      && !defined NO_HIDDEN && defined USE_LDCONFIG
 #   define __hidden_proto_hiddenattr(attrs...) \
   __attribute__ ((visibility ("hidden"), ##attrs))
 #   define hidden_proto(name, attrs...) \
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<tr><th>author</th><td>Jakub Kądziołka &lt;kuba@kadziolka.net&gt;</td><td class='right'>2020-06-21 03:06:16 +0200</td></tr>
<tr><th>committer</th><td>Jakub Kądziołka &lt;kuba@kadziolka.net&gt;</td><td class='right'>2020-07-18 16:40:15 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/guix/commit/gnu/packages/backup.scm?id=849f6e0ff99ab743c8478508af9a40e48364ff67'>849f6e0ff99ab743c8478508af9a40e48364ff67</a> (<a href='/guix/patch/gnu/packages/backup.scm?id=849f6e0ff99ab743c8478508af9a40e48364ff67'>patch</a>)</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/guix/commit/gnu/packages/backup.scm?id=386457b7bda963be9f0119a785b71bc64e0c105e'>386457b7bda963be9f0119a785b71bc64e0c105e</a> (<a href='/guix/diff/gnu/packages/backup.scm?id=849f6e0ff99ab743c8478508af9a40e48364ff67&amp;id2=386457b7bda963be9f0119a785b71bc64e0c105e'>diff</a>)</td></tr><tr><th>download</th><td colspan='2' class='oid'><a href='/guix/snapshot/guix-849f6e0ff99ab743c8478508af9a40e48364ff67.tar.gz'>guix-849f6e0ff99ab743c8478508af9a40e48364ff67.tar.gz</a><br/><a href='/guix/snapshot/guix-849f6e0ff99ab743c8478508af9a40e48364ff67.zip'>guix-849f6e0ff99ab743c8478508af9a40e48364ff67.zip</a><br/></td></tr></table>
<div class='commit-subject'>build-system/python: Install to the python output if present.</div><div class='commit-msg'>* gnu/build/python-build-system.scm (python-output): New procedure.
  (site-packages, install): Use python-output to find the output path.
  (wrap, rename-pth-file): Use site-packages where appropriate.
* doc/guix.texi (Build Systems): Mention the new behavior.
</div><div class='diffstat-header'><a href='/guix/diff/?id=849f6e0ff99ab743c8478508af9a40e48364ff67'>Diffstat</a> (limited to 'gnu/packages/backup.scm')</div><table summary='diffstat' class='diffstat'></table><div class='diffstat-summary'>0 files changed, 0 insertions, 0 deletions</div><table summary='diff' class='diff'><tr><td></td></tr></table></div> <!-- class=content -->
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