[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 #9 from github-bugzilla at puremagic.com ---
Commits pushed to master at https://github.com/dlang/installer

https://github.com/dlang/installer/commit/4790451e11f3891cf74efa54b9e1b2e29fd4eaa9
fix Issue 18649 - curl on Ubuntu 18.04 depends on libcurl4, ...

... .deb installer depends on libcurl3

- depend on libcurl4 | libcurl3 alternative
- degrading libcurl from dependency to recommends would be welcome,
  but does not work because recommendations are not installed for raw
  .deb packages (--fix-broken only installs dependencies).
  `dpkg -i dmd_2.079.1-0_amd64.deb && apt-get --fix-broken install`
- also add suggested libcurl-dev alternative

https://github.com/dlang/installer/commit/8233177ccc37c4ca5e6a8cfdc39b0a06ece5b2d7
Merge pull request #318 from MartinNowak/test_pkg_install

fix Issue 18649 - curl on Ubuntu 18.04 depends on libcurl4, ...

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