di-set: add "const" to a cast

[pspp] / ChangeLog

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+2011-02-08  Jim Meyering  <meyering@redhat.com>
+
+       di-set: add "const" to a cast
+       * lib/di-set.c (di_set_insert): Cast hash_insert0 argument to
+       "(void const *)", not "(void *)".  Spotted by Bruno Haible.
+
 2011-02-06  Bruno Haible  <bruno@clisp.org>
 
        Rename module 'wctype' to 'wctype-h'.