Update Ubuntu requirements

Closed Leif Metcalf requested to merge leif/ghcup:patch-1 into master
  • 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.

Edited by Leif Metcalf

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