[Issue 18649] curl on Ubuntu 18.04 depends on libcurl4, .deb installer depends on libcurl3

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18649

--- Comment #4 from Alex Whitman <alex.whitman at durham.ac.uk> ---
My 18.04 install was done just before curl was moved to libcurl4 so for now I'm
holding back the upgrade of those packages, meaning I was able to install the
2.079.0 deb.

The solution might be as simple as changing the dependency to libcurl3 OR
libcurl4 but I don't know the internals at all to know if that would work.

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