Make the encryption classes usable by tools.

h2/src/main/org/h2/security/AES.java

@@ -29,10 +29,6 @@ public class AES implements BlockCipher {
     private int[] encKey = new int[44];
     private int[] decKey = new int[44];
 
-    AES() {
-        // do nothing
-    }
-
     private static int rot8(int x) {
         return (x >>> 8) | (x << 24);
     }

h2/src/main/org/h2/security/XTEA.java

@@ -21,10 +21,6 @@ public class XTEA implements BlockCipher {
     private int k0, k1, k2, k3, k4, k5, k6, k7, k8, k9, k10, k11, k12, k13, k14, k15;
     private int k16, k17, k18, k19, k20, k21, k22, k23, k24, k25, k26, k27, k28, k29, k30, k31;
 
-    XTEA() {
-        // do nothing
-    }
-
     public void setKey(byte[] b) {
         int[] key = new int[4];
         for (int i = 0; i < 16;) {