Bug#864544: libgetopt-long-descriptive-perl: option value : and :+ processing are very broken

[Graham Cobb]

Apologies, Gregor, for my misunderstanding. I had thought that
libgetopt-long-descriptive-perl provided both. I have now removed
libgetopt-long-descriptive-perl from my system and the problem remains
so, of course, you are right.

By the way, I have confirmed that the problem does NOT occur on my
jessie system (perlbase 5.20.2-3+deb8u7). On that system the option
parsing works according to the documentation.