All reports of more-than-one-patch-system for the archive. The extended description of this tag is:
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.
This tag has not been emitted in any package tested by Lintian.