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=2f7e80102defc6c4e469d1dc94441e7f054e5310&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=2f7e80102defc6c4e469d1dc94441e7f054e5310&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/services?id=2f7e80102defc6c4e469d1dc94441e7f054e5310&amp;showmsg=1'>services</a>/<a href='/guix/log/gnu/services/herd.scm?id=2f7e80102defc6c4e469d1dc94441e7f054e5310&amp;showmsg=1'>herd.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/gnu/services/herd.scm?id=2f7e80102defc6c4e469d1dc94441e7f054e5310'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2023-07-21 11:58:44 -0400'>2023-07-21</span></td><td class='logsubject'><a href='/guix/commit/gnu/services/herd.scm?id=f15c5edb1a2423402b32a5262627eb2141becf65'>services: herd: Add a new 'current-service' procedure.</a></td><td>Maxim Cournoyer</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/services/herd.scm (current-service): New procedure, mostly reusing the
existing current-services.
(current-services): Implement in terms of the above procedure.


</td></tr>
<tr class='logheader'><td><span title='2023-05-30 00:15:29 +0200'>2023-05-30</span></td><td class='logsubject'><a href='/guix/commit/gnu/services/herd.scm?id=d23d8fcee99e7b127f9e649925caca9cf0d36e76'>services: herd: "Resolve" transient services only when needed.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
This allows us to get rid of the "eval root" actions, which in turn
would lead to confusing "Evaluating user expression" messages.

Fixes &lt;https://issues.guix.gnu.org/55857&gt;.

* gnu/services/herd.scm (resolve-transients): In 'values', avoid
'eval-there' call when UNRESOLVED is empty.


</td></tr>
<tr class='logheader'><td><span title='2023-04-21 16:16:37 +0200'>2023-04-21</span></td><td class='logsubject'><a href='/guix/commit/gnu/services/herd.scm?id=95731b4ef1991f5b85aa9ec9d4fb97c006bec65d'>services: herd: 'load-services/safe' is synonymous with 'load-services'.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
This is a followup to 547965aa27b6a09cadf42130b7ec7db3f1aee61f.

* gnu/services/herd.scm (load-services/safe): Make an alias for
'load-services'.


</td></tr>
<tr class='logheader'><td><span title='2023-03-26 23:24:23 +0200'>2023-03-26</span></td><td class='logsubject'><a href='/guix/commit/gnu/services/herd.scm?id=547965aa27b6a09cadf42130b7ec7db3f1aee61f'>services: herd: Remove workaround for Shepherd &lt; 0.5.0.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/services/herd.scm (load-services/safe): Remove workaround for
Shepherd &lt; 0.5.0, released in 2018.


</td></tr>