openssh: Rewrite openbsd-compat/readpassphrase.c. We don't have any of the POSIX signals, so we don't have to worry about the signals mess up the code flow.
openssh: Rewrite openbsd-compat/readpassphrase.c. We don't have any of the
POSIX signals, so we don't have to worry about the signals mess up the code
flow.

8l/barrelfish,8l/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,8l/barrelfish,kishoredbn/barrelfish,kishoredbn/barrelfish,utsav2601/cmpe295A,utsav2601/cmpe295A,linusyang/barrelfish,kishoredbn/barrelfish,8l/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,linusyang/barrelfish,kishoredbn/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,mslovy/barrelfish,8l/barrelfish,utsav2601/cmpe295A,BarrelfishOS/barrelfish,mslovy/barrelfish,mslovy/barrelfish,kishoredbn/barrelfish,mslovy/barrelfish,linusyang/barrelfish,linusyang/barrelfish,linusyang/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,BarrelfishOS/barrelfish,utsav2601/cmpe295A,BarrelfishOS/barrelfish,kishoredbn/barrelfish,8l/barrelfish