[CentOS] NUX Skype for Linux

I had cause to install the Skype for Linux package from the NUX repo. 
I discover that this package is configured to automatically start
Skype whenever one logs on to the Gnome desktop.  This behaviour I do
not wish.  However, there seems to be no option in Skype to turn that
'feature' off. Is there any way to disable this in Gnome or elsewhere?

I will be removing Skype shortly when the present need for it passes
but I do not wish this thing automatically starting in the meantime.


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