More cpu cleanups, only for 6.6.

src/backend/main/main.c

src/backend/storage/buffer/s_lock.c

src/backend/utils/adt/float.c

src/include/port/bsd.h

src/include/port/bsdi.h

src/include/port/freebsd.h

src/include/port/linux.h

src/include/port/univel.h

src/include/storage/s_lock.h