abort routine will cause sig_xxx() reference.

[BSP] fixed compile error under linux platform in fh8620 bsp.

fix loongson 1c启动异常

FH8620 BSP
Copyright (c) 2016 Shanghai Fullhan Microelectronics Co., Ltd.
All rights reserved

fix can baud rate config error in bsp/stm32f10x  fix #597

function `rt_pin_write` is invoked by  function `can_bus_hook`, and it should to be initialized by gpio.c.
but gpio.c was not added in SConscript

enum CANBAUD was changed in components/drivers/include/drivers/can.h ,
which causes array index out of bound in bsp/stm32f10x/drivers/bxcan.c

temporarily remove RT_CAN_USING_BUS_HOOK, because there are some bugs in
bsp/stm32f10x/applications/canapp.c  function can_bus_hook

Update serial.c

fix reset serial receive interrupt flag when close serial

remove function finsh_set_device in application.c in bsp/stm32f10x

finsh_set_device is not needed since version 1.2.0

fix initialization error in bsp/stm32f10x

temporarily disable canapp initialization.

fix various bugs in lwip-nat

This bug causes buffer overrun.

LWIP_NAT_TMR_INTERVAL_SEC defined in ipv4_nat.h is in miliseconds,
but ip_nat_check_timeout() thinks it's in seconds.

With this bug, all nat entries will expire immediately when
ip_nat_check_timeout() is called.

Note sys_timeout() is in miliseconds.

SCons PreProcessor patch: Stop processing "#define" in false condition