Update Ubuntu requirements

• g++, gcc, make, and xz-utils are all part of build-essential
• libtinfo-dev and ncurses-dev are now just libtinfo5
• realpath is provided by coreutils
• libffi-dev is needed by ghc

What is python3 needed for? I've kept it in just in case, but stack doesn't use it and I can't find it when grep-ing the repository.

Ignore this for now, since libtinfo.so.5 is not provided by libncurses-dev.

Stack uses the ghc-8.6.5-x86_64-fedora27-linux.tar.xz bindist for Ubuntu. Should we use that one too?

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• 05fca92c - Update Ubuntu requirements

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• 40bd358b - Update Ubuntu requirements
• 8272a7ba - Remove unneeded dependency

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I've fixed the dependency list so that it now provides libtinfo.so.5. It should be good now. I removed python3 in a separate commit in case it is still needed.

I'll make a separate MR to use the fedora27 bindist for ubuntu.

mentioned in merge request !107 (merged)

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