Update libsrtp to version 2.0

crypto/include/alloc.h

Index: crypto/include/alloc.h
diff --git a/srtp/crypto/include/alloc.h b/crypto/include/alloc.h
similarity index 92%
copy from srtp/crypto/include/alloc.h
copy to crypto/include/alloc.h
index 5980eed6c13c6be2c43be308cc3e9d8a81676386..ebe3755f09c521d788cbc3db49837dd43f6ebd7e 100644
--- a/srtp/crypto/include/alloc.h
+++ b/crypto/include/alloc.h
@@ -48,10 +48,16 @@
 
 #include "datatypes.h"
 
-void *
-crypto_alloc(size_t size);
+#ifdef __cplusplus
+extern "C" {
+#endif
 
-void
-crypto_free(void *ptr);
+void * srtp_crypto_alloc(size_t size);
+
+void srtp_crypto_free(void *ptr);
+
+#ifdef __cplusplus
+}
+#endif
 
 #endif /* CRYPTO_ALLOC_H */