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...) \
'h' onchange='this.form.submit();'>
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<tr><td><span title='2023-02-16 22:41:03 +0200'>2023-02-16</span></td><td><a href='/guix/commit/gnu/packages/ada.scm?id=672036c6dfe508810b565f4cf38e4f2aad2f7151'>gnu: Remove unneeded module imports.</a></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-05-31 14:52:14 -0400'>2022-05-31</span></td><td><a href='/guix/commit/gnu/packages/ada.scm?id=74641c7f66bc18a29aa92777a9616415eed6661e'>gnu: Remove python2-langkit.</a></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/ada.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-07-18 19:50:01 +0200'>2021-07-18</span></td><td><a href='/guix/commit/gnu/packages/ada.scm?id=0e47fcced442d8e7c1b05184fdc1c14f10ed04ec'>Merge branch 'master' into core-updates</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-07-18 12:03:29 +0300'>2021-07-18</span></td><td><a href='/guix/commit/gnu/packages/ada.scm?id=e4b70bc55a538569465bcedee19d1f2607308e65'>gnu: ada-ed: Adjust target system.</a></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-06-29 12:37:31 +0200'>2021-06-29</span></td><td><a href='/guix/commit/gnu/packages/ada.scm?id=d284e35196975788be68165ccf1f770a2481d938'>gnu: python2-libadalang: Remove package.</a></td><td>zimoun</td></tr>