Bug#880430: lintian: check for invalid arguments to dpkg-maintscript-helper

[Andreas Beckmann <anbe@debian.org>]

And now I've hit myself with a quoted version number in a .maintscript
that got ~ and + escaped by debhelper 10:

'20100216+1~' ==> '20100216\+1\~'

single quotes and backslash escaping is too much ...

after unquoting:

20100216+1~ ==> 20100216\+1\~

See #881990, nvidia-kernel-common 20151021+5.


Andreas