This reverts commit 5a6f3f37.

from a fast search seems to me not needed anymore after saw these:
https://github.com/linuxmint/cinnamon-session/commit/16371b437e7bb98610bca2c814d43491a5d65173
https://github.com/linuxmint/cinnamon-session/pull/128

is better to check it anyway, here step for reproduce the issue if still
present
https://github.com/linuxmint/cinnamon-session/pull/117#issuecomment-386605347

Update to upstream version '5.8.1'
with Debian dir d81e947da371a2bc9d8d3a276b3c5340eb131d69

Update to upstream version '5.6.0'
with Debian dir 2430c10deb1a4721f7f49e949ed42d6484095408

Remove unnecessary constraints

See merge request !3

* Build-Depends: Drop versioned constraint on gnome-pkg-tools, intltool, libglib2.0-dev, libgtk-3-dev, libjson-glib-dev, libupower-glib-dev, libxapp-dev and meson.
* cinnamon-session: Drop versioned constraint on upower in Depends.

Changes-By: deb-scrub-obsolete

missed on previous commit

Fix some issues reported by lintian

See merge request !2

Changes-By: lintian-brush
Fixes: lintian: debian-rules-uses-as-needed-linker-flag
See-also: https://lintian.debian.org/tags/debian-rules-uses-as-needed-linker-flag.html

Changes-By: lintian-brush
Fixes: lintian: trailing-whitespace
See-also: https://lintian.debian.org/tags/trailing-whitespace.html

gconf part was remove in 5.4.0

Update to upstream version '5.4.0'
with Debian dir f5953195282c97367f2c4a2237e7c11b653599bc

* prepare upload to unstable

don't merge watch file change because the master one is wrong