Update libzrtp version

Modified-by: Travis Cross <tc@traviscross.com>
Signed-off-by: Travis Cross <tc@traviscross.com>

libs/libzrtp/include/zrtp_version.h

@@ -13,7 +13,7 @@
 #define LIBZRTP_VERSION_MAJOR		1
 
 #define LIBZRTP_VERSION_MINOR		15
-#define LIBZRTP_VERSION_BUILD		607
-#define LIBZRTP_VERSION_STR			"v1.15 607"
+#define LIBZRTP_VERSION_BUILD		609
+#define LIBZRTP_VERSION_STR			"v1.15 609"
 
 #endif /*__ZRTP_VERSION_H__*/