error message improvement after seeing...

error message improvement after seeing http://www.nabble.com/Native-maven-support-requires-Java-1.5-or-later-td20929449.html

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@13497 71c3de6d-444a-0410-be80-ed276b4c234a

maven-agent/src/main/java/hudson/maven/agent/Main.java

@@ -115,6 +115,7 @@ public class Main {
             try {
                 if(Float.parseFloat(v)<49.0) {
                     System.err.println("Native maven support requires Java 1.5 or later, but this Maven is using "+System.getProperty("java.home"));
+                    System.err.println("Please use the freestyle project.");
                     System.exit(1);
                 }
             } catch (NumberFormatException e) {