tty: split job control support into a file of its own

2017-04-18T16:01:52Z

This makes it easier for job control to become optional and/or usable independently from tty_io.c, as well as providing a nice purpose separation. No logical changes from this patch. Signed-off-by: Nicolas Pitre Signed-off-by: Greg Kroah-Hartman

kernel.git/drivers/tty/tty_jobctrl.c, branch linux-4.13.y

tty: split job control support into a file of its own