leak-detective: align allocations on both 32 and 64-bit systems to 32 bytes

src/libstrongswan/utils/leak_detective.c

@@ -98,6 +98,11 @@ struct memory_header_t {
 	 */
 	backtrace_t *backtrace;
 
+	/**
+	 * Padding to make sizeof(memory_header_t) == 32
+	 */
+	u_int32_t padding[sizeof(void*) == sizeof(u_int32_t) ? 3 : 0];
+
 	/**
 	 * Number of bytes following after the header
 	 */