ser2net: Fix compilation failures due to missing TIOCSRS485 macro

Patch sent upstream:
	https://sourceforge.net/p/ser2net/mailman/message/32905302/

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>

From: Yegor Yefremov <yegorslists@googlemail.com>

include <asm-generic/ioctls.h> fixes compilations for systems,
where <asm-generic/ioctls.h> won't be included automatically.

Move special Linux includes to dataxfer.h.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
---
 dataxfer.h | 5 +++--
 devcfg.c   | 2 --
 2 files changed, 3 insertions(+), 4 deletions(-)

--- a/dataxfer.h
+++ b/dataxfer.h
@@ -20,8 +20,6 @@
 #ifndef DATAXFER
 #define DATAXFER
 
-#include <linux/serial.h>
-
 #include "controller.h"
 
 #ifdef USE_UUCP_LOCKING
@@ -30,6 +28,9 @@ extern int uucp_locking_enabled;
 
 #ifdef linux
 
+#include <linux/serial.h>
+#include <asm-generic/ioctls.h>
+
 #define USE_RS485_FEATURE
 
 /* Check, if the toolchain provides serial_rs485 structure and macros */
--- a/devcfg.c
+++ b/devcfg.c
@@ -18,7 +18,6 @@
  */
 
 /* This code handles generating the configuration for the serial port. */
-
 #include <unistd.h>
 #include <termios.h>
 #include <sys/ioctl.h>
@@ -31,7 +30,6 @@
 #include <signal.h>
 #include <errno.h>
 #include <syslog.h>
-#include <linux/serial.h>
 
 #include "ser2net.h"
 #include "selector.h"