Lintian tag information: more-than-one-patch-system (type: warning)

Description (from lintian-explain-tags)

Either the build-dependencies list more than one patch system or the
package uses the 3.0 (quilt) source format but also has a dependency on
dpatch. It's unlikely that you need both patch systems at the same time,
and having multiple patch systems in play simultaneously can make
understanding and modifying the source package unnecessarily complex.

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

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