Unnecessary reentrant synchronized block in java.awt.Cursor

There is lock on a field java.awt.Cursor.systemCustomCursors which is taken twice:
1. In a method java.awt.Cursor#getSystemCustomCursor:
```
            synchronized(systemCustomCursors) {
                if (systemCustomCursorProperties == null)
                    loadSystemCustomCursorProperties();
            }
```
2. And then again in method 'loadSystemCustomCursorProperties' itself
```
private static void loadSystemCustomCursorProperties() throws AWTException {
        synchronized(systemCustomCursors) {
            systemCustomCursorProperties = new Properties();
```

Such reentrancy is redundant and confusing.