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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