fix bitrot in sqlite library

contrib/sqlite/sqlite.factor

@@ -35,6 +35,7 @@ USE: compiler
 USE: errors
 USE: strings
 USE: namespaces
+USE: sequences
 
 BEGIN-STRUCT: sqlite3
 END-STRUCT
@@ -172,7 +173,7 @@ END-STRUCT
   #! Prepare a SQL statement. Returns the statement which
   #! can have values bound to parameters or simply executed.
   #! TODO: Support multiple statements in the SQL string.
-  dup string-length <sqlite3-stmt-indirect> dup >r 
+  dup length <sqlite3-stmt-indirect> dup >r 
   <char*-indirect> sqlite3_prepare sqlite-check-result
   r> sqlite3-stmt-indirect-pointer ;