OPENJPA-1838: allow FKs to be added when using Sybase

git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@1023351 13f79535-47bb-0310-9956-ffa450edef68

openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/SybaseDictionary.java

@@ -195,12 +195,6 @@ public class SybaseDictionary
         setObject(stmnt, idx, new BigDecimal(val), Types.BIGINT, col);
     }
 
-    @Override
-    public String[] getAddForeignKeySQL(ForeignKey fk) {
-        // Sybase has problems with adding foriegn keys via ALTER TABLE command
-        return new String[0];
-    }
-
     @Override
     public String[] getCreateTableSQL(Table table) {
         if (!createIdentityColumn)