Lintian tag information: illegal-variable (type: error)

Description (from lintian-explain-tags)

With debhelper compatibility level >= 13 (and also dh-exec before it)
several files in the ./debian folder support the expansion of variables.
Unfortunately, people sometimes confuse the DEB_BUILD_* variables with the
similarly-named DEB_HOST_* variables.

Some conditions are difficult to detect but it is never correct to use
DEB_BUILD_MULTIARCH in debian/*.install or in debian/*.links.

Please use DEB_HOST_MULTIARCH instead of DEB_BUILD_MULTIARCH.

Please refer to
https://wiki.debian.org/Multiarch/Implementation#Recipes_for_converting_packages
and Bug#983219 for details.

Visibility: error
Show-Always: no
Check: debian/variables

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