hal/gpiomap: adapt to new rtapi_bitops.h API
hal/gpiouse: adapt to new rtapi_bitops.h API
tests/rtapi_printf.0: enable for kbuilds only
src/Makefile: reorganize subdir list

this was an excellent source of merge conflicts
rtapi/examples: remove extint, fifo, semaphore examples

those arent available in RTAPI anymore and were never used.