Your changelog entry has UNRELEASED as a distribution, you shoudl change that before publishing if you ask for sponsorship and not just a review (though it's not a problem for a sponsor to edit that before uploading).
You should have a section for debian/* in d/copyright. You don't need to use DPKG_EXPORT_BUILDFLAGS and /usr/share/dpkg/buildflags.mk when using dh_auto_* in compat levels 9+. You are creating debian/scythe.1 but not cleaning it so it ends up in debian.tar which is wrong. Your d/watch doesn't work. You should use http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/ as the copyright format URL (lintian detects this). The upstream Makefile ignores CPPFLAGS from the environment so fortify dpkg-buildflags feature doesn't work (lintian detects this). -- WBR, wRAR
signature.asc
Description: Digital signature