Certain boolean mode queries with truncation operator did
not return matching records and calculate relevancy
incorrectly.

myisam/ft_boolean_search.c:
  Sort ftb->list in ascending order. This helps to fix binary
  search in ft_boolean_find_relevance() without rewriting it
  much.
  
  Fixed binary search in ft_boolean_find_relevance(), so it finds
  right-most element in an array.
  
  Fixed that ft_boolean_find_relevance() didn't return match for
  words with truncation operator in case query has other non-
  matching words.
mysql-test/r/fulltext.result:
  A test case for BUG#37245.
mysql-test/t/fulltext.test:
  A test case for BUG#37245.