implement a few methods to make SWT 3.4 happy

classpath/java/lang/StringBuffer.java

@@ -93,6 +93,11 @@ public class StringBuffer implements CharSequence {
     return this;
   }
 
+  public synchronized StringBuffer insert(int i, int v) {
+    sb.insert(i, v);
+    return this;
+  }
+
   public synchronized StringBuffer delete(int start, int end) {
     sb.delete(start, end);
     return this;

classpath/java/lang/StringBuilder.java

@@ -154,6 +154,10 @@ public class StringBuilder implements CharSequence {
     return insert(i, new String(new char[] { c }, 0, 1, false));
   }
 
+  public StringBuilder insert(int i, int v) {
+    return insert(i, String.valueOf(v));
+  }
+
   public StringBuilder delete(int start, int end) {
     if (start >= end) {
       return this;

classpath/java/util/Calendar.java

@@ -45,6 +45,12 @@ public abstract class Calendar {
     fields[field] = value;
   }
 
+  public void set(int year, int month, int date) {
+    set(YEAR, year);
+    set(MONTH, month);
+    set(DAY_OF_MONTH, date);
+  }
+
   public void setTime(Date date) {
     time = date.getTime();
   }