Ext. setup method: check that the old setup exe exists/is not stale.
Old behaviour resulted in weird errors in some circumstances (e.g. if '~/.cabal' was deleted between 'configure' and 'build'). Fixes #1570.
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Old behaviour resulted in weird errors in some circumstances (e.g. if '~/.cabal' was deleted between 'configure' and 'build'). Fixes #1570.