Adding test.
ctype-win1250ch.c:
  Bug #9759 Empty result with 'LIKE' and cp1250_czech_cs
  Wrong min_sort_char fix.


strings/ctype-win1250ch.c:
  Bug #9759 Empty result with 'LIKE' and cp1250_czech_cs
  Wrong min_sort_char fix.
mysql-test/t/ctype_cp1250_ch.test:
  Adding test.
mysql-test/r/ctype_cp1250_ch.result:
  Adding test.