enable tame(2) in who(1).

enable tame(2) in who(1).

some refactor to grab ttyname(0) early and use it later.
gradually drop tame requests when no more needed.

"ioctl" is used for grab ttyname(0)
"rpath" is for -T and -u flag, that used stat(2) to get terminal status

initial patch from deraadt with help from guenther

ok deraadt@