[PATCH] do not discard long subject lines

[Dennis Preiser]

tin does not display the subject of the following article at group
level:

| From: Michael Baeuerle <***@stz-e.de>
| Newsgroups: de.alt.test
| Subject: MIME header encoding test: =?ISO-8859-1?Q?W=F6rd?= (dies ist ein
| zwei drei
| =?ISO-8859-1?Q?=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4?=
| =?ISO-8859-1?Q?=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4?=
| =?ISO-8859-1?Q?=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4?=
| =?ISO-8859-1?Q?=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4?=
| =?ISO-8859-1?Q?=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4=E4?=
| =?ISO-8859-1?Q?=E4=E4=E4?= Wort)
| Date: 30 Nov 2013 18:03:45 -0000
| Lines: 12
| Message-ID: <2013-11-***@micha.freeshell.org>

The attached patch fixes this for me.

Dennis