DragonFlyBSD

Here's a trivial patch to improve mail(1)/mailx(1)/Mail(1) a little bit:
take notice of terminal/window size changes. To experience the effect:

- run mail(1) in a, say, 80 column terminal window on some
      mailbox and "h" to see a header listing, which will typically
      have space only for abridged subjects:

& h

N 1 root@freddie.marshla Sun Dec 15 03:01 89/3080 "freddie.marshlabs.gae"

N 2 root@freddie.marshla Sun Dec 15 03:01 120/5253 "freddie.marshlabs.gae"
N 3 root@freddie.marshla Mon Dec 16 03:14 82/2880 "freddie.marshlabs.gae"
N 4 root@freddie.marshla Mon Dec 16 03:15 119/5252 "freddie.marshlabs.gae"
&

- resize the terminal width to, say, 132 columns.
    - re-issue the "h".

Without this patch, the subjects will still be abridged as before,
with the patch the new extra space gets used.

Martin