Adding C macro to enable main() to be renamed - #81
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This PR enables main() to be renamed easily by defining a C macro "MAIN_FUNC_NAME".
Normally the macro MAIN_FUNC_NAME should be undefined, and by default it is mapped to main() within core_main.c.
So there is no different from the original code. However, if needed, user can add a definition of MAIN_FUNC_NAME in core_portme.h. For example, by adding:
#define MAIN_FUNC_NAME coremark_task
The "main" function became "coremark_task".
This enhancement addresses the need described in #56
and allow CoreMark to be handled as a task inside an RTOS environment, where the real main is executed before/when the RTOS starts.