Make autogen OS X friendly (needs portability fix)
Make libbitfury.c use portable CPU and wall clock calculations
	modified:   autogen.sh
	modified:   libbitfury.c
	Working sort of, but abadoning for now...
	modified:   cgminer.c
	modified:   libbitfury.c
	modified:   spidevc.c
	modified:   tm_i2c.c
	Working with FTDI!
	modified:   libbitfury.c
	modified:   spidevc.c