The lpt(4) driver supports many more abilities than MAKEDEV is aware
of.  Right now, the names are:

lpa0	interruptless driver
lpt0	"normal" driver, uses interrupts

I propose the following letters be added for the following functions:

lpt0p	Don't prime the device on initial open
lpt0l	Automatically send a LF with CR
lpt0pl	Both.

The same for lpa0.

Comments?