RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ 7e88b9cfcf19b63e621447b42e28f78b9a3746c9

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bernard.xiong b5fbf220b3 add newlib stub building script.		15 anni fa
..
SConscript	b5fbf220b3 add newlib stub building script.	15 anni fa
math.c	914e281892 add more stub for newlib porting.	15 anni fa
syscalls.c	b5fbf220b3 add newlib stub building script.	15 anni fa