fb3f835089
add __STDC_LIMIT_MACROS macro in Keil add RT_USING_LIBC in simulator add _DLIB_ADD_EXTRA_SYMBOLS=0 in IAR
DLIB (IAR) porting for RT-Thread
http://www.iarsys.co.jp/download/LMS2/arm/7502/ewarm7502doc/arm/doc/EWARM_DevelopmentGuide.ENU.pdf P.130