Applying Oliver Heger's patch for CLI-121, changing a HashSet to a LinkedHashSet so we pass tests on JDK 1.6. This moves us to a JDK 1.4+ dependency, but I don't think that's an issue.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/cli/trunk@629710 13f79535-47bb-0310-9956-ffa450edef68

Author: hen

src/java/org/apache/commons/cli2/builder/PatternBuilder.java

@@ -16,8 +16,8 @@
  */
 package org.apache.commons.cli2.builder;
 
-import java.util.HashSet;
 import java.util.Iterator;
+import java.util.LinkedHashSet;
 import java.util.Set;
 
 import org.apache.commons.cli2.Argument;
@@ -64,7 +64,7 @@ public PatternBuilder(
         this.abuilder = abuilder;
     }
 
-    private final Set options = new HashSet();
+    private final Set options = new LinkedHashSet();
 
     /**
      * Creates a new Option instance.