* POSIX include files merged into newlib. This resulted in
some definitions moving to other files and thus some secondary
effects in RTEMS source code.
* machine/types.h: Added _CLOCKID_T_ and _TIMER_T_ to be in sync
with newlib's <machine/types.h>.
* rtems/rtems_bsdnet_internal.h: newlib now includes definition
of struct itimerval in <sys/time.h>.
* lib/tftpDriver.c: add comments to handlers struct function pointers.
* rtems/rtems_glue.c: move pointer arithmetic to be _after_
pointer has been checked against NULL.
* machine/types.h, pppd/pppd.h, rtems/rtems_bsdnet_internal.h,
rtems_webserver/webmain.c: machine/types.h should not have
included rtems.h. It is now including precisely the
least amount of low level, yet portable .h files to get
the basic RTEMS types defined. This rippled into other
files since rtems_bsdnet_internal.h used machine/types.h to include
rtems.h.
* rtems/rtems_syscall.c: Changed from O_NONBLOCK to internal
RTEMS_LIBIO_FLAGS_NO_DELAY to avoid O_NONBLOCK/O_NDELAY confusion
and to work with the converted flags.