Lintian tag information: license-problem-gfdl-invariants (type: error)

Description (from lintian-explain-tags)

The given source file is licensed under GFDL with invariant section or
front-cover or back-cover text.

GFDL with invariant sections, front-cover or back-cover texts are not
suitable for main.

If this file be multi-licensed, please override the tag.

Please refer to https://wiki.debian.org/qa.debian.org/gfdlinvariant and
https://www.debian.org/vote/2006/vote_001 for details.

Visibility: error
Show-Always: no
Check: cruft

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