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Convert hadrian buildscripts to unsuffixed, dashed form

final cleanups

When Hadrian failed to build, the script would pick a previously built
Hadrian (if available) instead of failing.

This partly resolves #16325 (https://ghc.haskell.org/trac/ghc/ticket/16325).

As previously discussed in https://github.com/snowleopard/hadrian/issues/667,
we do not need the symlink traversal code in build scripts. However, it
appears we forgot to delete this code from our Stack-based build scripts,
which led to placing all build artefacts in an unexpected location when
using Hadrian in combination with symlink trees. This commit fixes this.

Sadly subtrees haven't worked quite as well as we would have liked for
developers. See Hadrian #440.