Revert "linux: Check for Logind first, then *Kit-s with UPower when detecting PM framework"

This reverts commit c70fa349c0a5c2392045dd00751f64391fbef2e2.
It was not wrong but it seems distributions are not yet ready and the logind
path for e.g. suspending is not as well implemented as the scripts called by
upower initiated power operations.
[pvr][cleanup] Return 'bRetrun' instead of 'true'.
cppcheck message: Variable 'bReturn' is assigned a value that is never used.
[infomanager] container.pluginname returns an empty string (fixes #15566)
Merge pull request #5827 from ace20022/fix_pvr_ret
fix: [linux] include ffmpeg tarball in mk-debian-package.sh

needed because we cannot download anything during debuild stage
Merge pull request #5826 from fritsch/upower

Revert "linux: Check for Logind first, then *Kit-s with UPower when detecting PM framework"
Revert "gl: multipass renderer would use wrong source pixels sizes"

This reverts commit 9255204c264b25969558035deeae4a6d2d7f2842.

breaks HQ scaling for sw decoding on Linux
Merge pull request #5830 from FernetMenta/scaling

Revert "gl: multipass renderer would use wrong source pixels sizes"
Merge pull request #5828 from mkortstiege/container_pluginname

[infomanager] container.pluginname returns an empty string (fixes #15566)
Merge pull request #5829 from wsnipex/fix-debian-package-script

fix: [linux] include ffmpeg tarball in mk-debian-package.sh