patch: remove gconf2 libgconf-2-4 deps

[marcaurele]

What

Remove dependencies that are gone from modern Debian based systems.

I did a local full build of etcher and could install it, and run it on my Debian testing system without problems.

Why

The tool cannot be installed on current system as those packages are gone.

For references, other projects removed those dependencies altogether:

• Remove gconf dependency signalapp/Signal-Desktop#3174
• Remove libgconf-2-4 dependency keybase/client#26149

Closes #4096

[marcaurele]

@aethernet this is a fix for #4096

[aethernet]

Thanks for the PR, can you rename you commit from fix: ... to patch: to make the CI gods happy?

[c0def1re]

Hi, new to all this, how can I use this patch now? or do I need to wait till its committed and a new .deb is released? thanks

[marcaurele]

@aethernet - anything else to do? The CI did not trigger again after the title rename.

[LucienMorey]

I just wanted to bump this, @aethernet. Am I correct in assuming that the last CI failure is not related to the change in this PR? I saw some adjustments to the CI a couple of weeks ago, which might mean that any CI-related issues have solved themselves.

I think this will either wholly or partly solve #4242, #4144, #4257, #4258, #4264, #4096, #4137 and a bunch of other issues that aren't filterable based on a gconf2 search in the issues section.