Support for nonstandard baud rate in SetCommState.

diff --git a/include/config.h.in b/include/config.h.in
index 5ab18df..f86f41c 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -238,6 +238,9 @@
 /* Define if you have the <linux/joystick.h> header file. */
 #undef HAVE_LINUX_JOYSTICK_H
 
+/* Define if you have the <linux/serial.h> header file. */
+#undef HAVE_LINUX_SERIAL_H
+
 /* Define if you have the <linux/ucdrom.h> header file. */
 #undef HAVE_LINUX_UCDROM_H