[Libc] Add some errno to dlib.

[bsp] Add some descriptions and an English version about building project in readme.txt.

[log trace] add log_file flush function

[Bsp] update stm32f107 spi driver

fix the end of module symbol bug when using iar compiler

    fixed error when enable "SPI2_USING_DMA"
    fixed warnning when using spi without DMA

[LWIP] Fix lwip 2.0.2 link status problem.

[bsp] update core clock and add led task

[bsp] fix incompatible type for finsh_system_init in bsp/lpc824

[bsp] fixed typo in bsp/lpc824 

[bsp] add new bsp for lpc824

Fix incompatible type error

[DeviceDriver] Fix rw009 WiFi module auto reconnect feature.

[BSP] Fix component initialization functions link order for IAR Linker

[BSP] Fix component initialization functions may be not sequential storage on ROM when used for IAR linker.

[Bsp] stm32f107 spi drv : dma add irq

[bsp] 在龙芯1c的编译配置脚本“rtconfig.py”中增加“交叉编译工具链的说明”

使用龙芯官方推出的那个用于编译linux的交叉编译工具链来编译RT-Thread会报错，
可以使用RT-Thread官方推荐那个

[bsp] fixed scons building error and update mdk project

[kernel] add main thread macro and rename tiny memory macro