Bug#746808: lintian: license-problem-non-free-RFC false positive

[Simon Josefsson <simon@josefsson.org>]

Package: lintian

Hi. I noticed that lintian complained about libidn:

http://lintian.debian.org/maintainer/help-libidn@gnu.org.html#libidn

The doc/specifications/rfc3454.txt file is not the verbatim RFC but a
cut-down version that only contains comments about its license plus the
data tables.  The comments should explain the licensing situation.

The lib/punycode.c and lib/punycode.h files is covered by the RFC 3492
additional license.

These are exceptions, so possibly libidn should override this lintian
check, or what would you recommend as a solution?

/Simon