fix to allow building on both Ubuntu 16.04 and 18.04.

[matjam]

As promised in https://github.com/mosra/magnum/issues/248, here is a PR that will allow builds to work for both Ubuntu 18.04 and 16.04. Note that some of the changes are also to allow the build to work correctly in Launchpad, as it builds from a clean chroot every time dependencies may not be available.

[codecov-io]

Codecov Report

Merging #31 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #31   +/-   ##
=======================================
  Coverage   49.41%   49.41%           
=======================================
  Files          12       12           
  Lines         425      425           
=======================================
  Hits          210      210           
  Misses        215      215

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[mosra]

Hmm. Unlike in the other PRs, here you don't mention corrade and corrade-dev among dependencies. Is that intentional?

(Same is in the example repo.)

[matjam]

hmm, might not have been necessary?

I'd have to go and rebuild everything in launchpad to check ... yikes.

[mosra]

Merged in 58d681bf9626aaa85815722524711ae591f7b5c4. Thanks! :)