Added an equals function to backtrace_t

src/libstrongswan/utils/backtrace.h

@@ -49,6 +49,14 @@ struct backtrace_t {
 	 */
 	bool (*contains_function)(backtrace_t *this, char *function[], int count);
 
+	/**
+	 * Check two backtraces for equality.
+	 *
+	 * @param other	backtrace to compare to this
+	 * @return		TRUE if backtraces are equal
+	 */
+	bool (*equals)(backtrace_t *this, backtrace_t *other);
+
 	/**
 	 * Destroy a backtrace instance.
 	 */