package/dos2unix: bump to version 7.4.1

See full changelog https://waterlan.home.xs4all.nl/dos2unix/ChangeLog



The hash of the license file is changed due to the following
modification:

-Copyright (C) 2009-2016  Erwin Waterlander
+Copyright (C) 2009-2019  Erwin Waterlander

Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>