more use of native flag

bindings/java/src/net/hyperic/sigar/util/Getline.java

@@ -76,8 +76,10 @@ public class Getline {
     public void initHistoryFile(File file)
         throws IOException {
 
+        if (useNative) {
             histinit(file.getCanonicalPath());
         }
+    }
 
     public void addToHistory(String line) {
         if ((line == null) ||
@@ -85,6 +87,8 @@ public class Getline {
         {
             return;
         }
+        if (useNative) {
             histadd(line);
         }
     }
+}