(%nonassoc and eof): #undef memcmp and realloc.

tests/conflicts.at

@@ -54,8 +54,10 @@ AT_DATA([input.y],
 [[
 %{
 #include <config.h>
-/* We don't need a perfect malloc for these tests. */
+/* We don't need perfect functions for these tests. */
 #undef malloc
+#undef memcmp
+#undef realloc
 #include <stdio.h>
 
 #if STDC_HEADERS