Fixes a fatal constness error with g++ 4.8.2.
--- aegis-4.24/common/ac/string/memmem.cc	2008-03-14 07:19:27.000000000 +0100
+++ aegis-4.24/common/ac/string/memmem.cc	2014-01-26 11:17:58.000000000 +0100
@@ -182,7 +182,7 @@
 
     // Use optimizations in memchr when possible.
     if (needle_len == 1)
-        return memchr(haystack, *needle, haystack_len);
+        return (void *) memchr(haystack, *needle, haystack_len);
 
     // Minimizing the worst-case complexity:
     // Let n = haystack_len, m = needle_len.
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<tr><td><span title='2023-07-18 00:41:15 +0200'>2023-07-18</span></td><td><a href='/guix/commit/doc/environment-gdb.scm?id=602e32c8e0e36d149e1424d8023a214abd3d34ba'>doc: Update GDB "guix shell" example to use autoconf-2.69</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/environment-gdb.scm: Change to use autoconf-2.69.
* gnu/packages/autotools.scm: Remove outdated GDB comment.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
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