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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<div class='path'>path: <a href='/guix/log/?id=81fea9f445fc71f4b2a31d61c4b0321d871f9f6d'>root</a>/<a href='/guix/log/.mailmap?id=81fea9f445fc71f4b2a31d61c4b0321d871f9f6d'>.mailmap</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/.mailmap?id=81fea9f445fc71f4b2a31d61c4b0321d871f9f6d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-08-16 22:22:06 +0200'>2023-08-16</span></td><td><a href='/guix/commit/.mailmap?id=fce924708c31c09a1b438ae7e8b83d39c492be9a'>Update email addresses for Juliana Sims.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Add an entry for Juliana.
* gnu/packages/admin.scm, gnu/packages/audio.scm,
gnu/packages/build-tools.scm, gnu/packages/scheme.scm: Update Juliana's email.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Juliana Sims</td></tr>
<tr><td><span title='2022-01-11 14:48:00 -0500'>2022-01-11</span></td><td><a href='/guix/commit/.mailmap?id=7f779286df7e8636d901f4734501902cc934a72f'>Update mailmap.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Add entry for Zheng Junjie.
</span></span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2021-11-06 16:03:43 +0100'>2021-11-06</span></td><td><a href='/guix/commit/.mailmap?id=567c4f4495fd1681bc6bd1ca3e9d1a87e120ac61'>Update mailmap and copyright assignments for Liliana Marie Prikler.</a><span class='msg-avail'>...<span class='msg-tooltip'>Use full names everywhere.

* .mailmap: Use full name for Liliana Marie Prikler.
* gnu/packages/zig.scm: Likewise.
</span></span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2021-09-06 12:15:57 +0200'>2021-09-06</span></td><td><a href='/guix/commit/.mailmap?id=7158f8e4e9f81dbe004789018dcf06a5fe87d602'>Update mailmap.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Add entry for Liliana Marie Prikler.
</span></span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2021-09-04 12:25:17 +0200'>2021-09-04</span></td><td><a href='/guix/commit/.mailmap?id=1fd0bf60ea261fac426052386029ead0ac68cad1'>Update mailmap.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Alias all my contributions to the same identity.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-07-27 12:34:56 -0400'>2021-07-27</span></td><td><a href='/guix/commit/.mailmap?id=c0e6e8d25e3750a35bebc80469ee86e7826bd769'>Update mailmap.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Add entry for Christine Lemmer-Webber.
</span></span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2021-07-08 09:48:22 +0200'>2021-07-08</span></td><td><a href='/guix/commit/.mailmap?id=0a04c25482c4d848a6a29711fccf5682319e26aa'>mailmap: Update entries for Matthew James Kraai.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Change name for Matthew James Kraai.
* gnu/packages/lisp-xyz.scm, gnu/packages/python-xyz.scm,
gnu/packages/rust.scm: Likewise.

Signed-off-by: Nicolas Goaziou &lt;mail@nicolasgoaziou.fr&gt;
</span></span></td><td>Matthew James Kraai</td></tr>
<tr><td><span title='2021-06-23 22:29:23 -0500'>2021-06-23</span></td><td><a href='/guix/commit/.mailmap?id=6d388103a4ed8f14f1ac6ac7a2ff22c5fa6b8cd4'>gnu: Add Sollya.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/algebra.scm (sollya): New variable.
* .mailmap: Adjust "proper email" for `git commit`.
</span></span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2021-04-21 18:02:27 -0400'>2021-04-21</span></td><td><a href='/guix/commit/.mailmap?id=449844474da86b5f10a4c5e4f1744e1e3a716d6e'>Update email address for Kei.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Remove obsolete email for Kei.
</span></span></td><td>Kei Kebreau</td></tr>