[packman] No NVenc on ffmpeg 3.4.4

[Wolfgang Bauer]

Well, according to a recent mail by Dave Plater, this seems to be not intentional:
http://lists.links2linux.de/pipermail/packman/2018-September/015745.html

There hasn't been a change to the package itself in this regard, and according to the specfile, nvidia support should actually still be enabled when built on Packman...

But I just found this in the prjconf of Packman/Essentials:
%if 0%{?suse_version} == 1500
%define _without_nvidia 1
%define _without_imagemagick 1
Macros:
%_without_nvidia 1
%_without_imagemagick 1
:Macros

and

%if 0%{?suse_version} == 1315
%define _without_nvidia 1
Macros:
%_without_nvidia 1
:Macros

This obviously (still) disables nvidia support for ffmpeg on Packman, for Leap 42 and 15 at least.
No idea why that's not been removed again yet though...

Kind Regards,
Wolfgang