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confirmed: current HEAD checkout does not find russian words

the patch fixes this problem for rdbms backend only, dbm and
xapian indexers are not affected.  perhaps i could port this
change to dbm backend.

more serious problem is that this patch contains hard-coded
charset, i.e. all database contents are assumed to be in
utf-8.  if we apply this patch, we lose the last chance to
ever support databases with different text encodings. (the
chances were not high anyway.)

Richard, do you think this is acceptable?