Lintian tag information: patch-system-but-direct-changes-in-diff (type: warning)

Description (from lintian-explain-tags)

The package uses a patch system, but the Debian diff.gz contains changes
to files or creation of additional files outside of the debian directory.
This often indicates accidental changes that weren't meant to be in the
package or changes that were supposed to be separated out into a patch.
The package will also more easily support possible future source package
formats if all changes outside the debian directory are stored as patches.

Visibility: warning
Show-Always: no
Check: debian/patches

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