Doesn't compile on Atollic 5.0.0

[marklakata]

include <sys/syscall.h>

is not needed on embedded systems -- since it doesn't exist! Perhaps this include should be conditional.

I'm using Atollic 5.0 (This is an ARM Cortex M3)

[scottt]

I believe this is fixed. I've not tested with the Atollic toolchain but have tested debugbreak.h with the GNU ARM Embedded Toolchain on Cortex-M.