Add spongy castle sources to libraries folder

libraries/spongycastle/jce/src/main/java/javax/crypto/ExemptionMechanism.java

@@ -0,0 +1,9 @@
+package javax.crypto;
+
+/**
+ * this is a place holder class, no exemption mechanism facility is
+ * required in this modified version of the JCE
+ */
+public class ExemptionMechanism
+{
+}