[bugfix] Open the #define RT_USING_LWIP in rtconfig.h , then build it , the stm32_eth.h can not find.
Signed-off-by: pangwei <271372443@qq.com>

1. Cleanup unused code in startup.c.
2. Init MMU before init INT contoroller for mapping vector table to visual address 0x0
3. Remove unused section in link scripts.

[bsp][stm32f03x] Modify build config to reduce code size for Travis CI

2. [bsp][sam9260] Remove unused ld file
3. [bsp][sam9260] Add J-Link debug scripts

1. [bsp][sam9260] Fix the bug that auto reset after boot 20s. Disable watchdog in rt_lovel_level_init function.
2. [bsp][sam9260] Modify SCONS scripts to support IAR tool chain.
3. [bsp][sam9260] Move link strips in to folder link_scripts.
4. [libcpu][arm926] Add copy right to source file and format code.

According to STM32 Manual, the USART RXNE flag will be clear automatically after
read to the USART_DR register[1], so the call to USART_ClearITPendingBit is
unnecessary.

[1]: See RM0090 Reference Manual p.992, Bit 5

format. It is targeted at 32 bit microcontrollers, but is also fit for
other embedded systems with tight (2-10 kB ROM, <1 kB RAM) memory
constraints.(http://koti.kapsi.fi/jpa/nanopb/)

How to use the example:
	1. move examples/nanopb to bsp/xxxx/
	2. enable macro RT_USING_NANOPB in rtconfig.h
	3. regenerate the project file (scons --target=xxxx)
	4. rebuild the project

2. [BSP] TM4C129x : According to LunchPad, change device id from TM4C1294XCNZAD   to TM4C1294NCPDT

complete in putc().