code cleanup


include/m_ctype.h:
  my_mbcharlen_8bit() { return 1 }
mysql-test/r/fulltext.result:
  fulltext on UTF
mysql-test/t/fulltext.test:
  fulltext on UTF
sql/item_cmpfunc.h:
  cleanup
sql/sql_table.cc:
  FULLTEXT: UCS2 is not allowed
sql/sql_yacc.yy:
  FULLTEXT: code cleanup
strings/ctype-bin.c:
  my_mbcharlen_8bit() { return 1 }
strings/ctype-latin1.c:
  my_mbcharlen_8bit() { return 1 }
strings/ctype-simple.c:
  my_mbcharlen_8bit() { return 1 }
strings/ctype-tis620.c:
  my_mbcharlen_8bit() { return 1 }
strings/ctype-utf8.c:
  hack: (to be fixed properly later) all multi-byte sequences are considered isalpha() now