Fix build on FreeBSD/powerpc64 #1895
Description
FreeBSD currently can't build OpenBLAS due to the following error:
../../common_power.h:816:23: error: 'START_ADDRESS' undeclared here (not in a function); did you mean 'BASE_ADDRESS'?
#define BASE_ADDRESS (START_ADDRESS - BUFFER_SIZE * MAX_CPU_NUMBER)
^
I can see that START_ADDRESS is already defined for Linux and AIX. What is this value used for? Do you know what it should be set to for FreeBSD?