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Memory use went up a little with my change to external names, as most
names got longer.  However, we're still doing better than 6.10 on this
test, so I don't mind bumping the limit a bit.

The earlier of --help and --version now determines the behaviour

It isn't necessary now that Cabal can find gcc in the new layout, and
it was taking a long time (2.5s on Windows every time you start up
make in the testsuite)