increase default buffer size in BufferedInputStream

The previous value of 32 bytes did not perform well.  This increases it to 4096 bytes, which matches BufferedOutputStream.

classpath/java/io/BufferedInputStream.java

@@ -22,7 +22,7 @@ public class BufferedInputStream extends InputStream {
   }
   
   public BufferedInputStream(InputStream in) {
-    this(in, 32);
+    this(in, 4096);
   }
 
   private void fill() throws IOException {