failures

Please folks, remember failing perf tests are not expected and should
always be investigated.  In particular I have no idea why T4801 is now
failing - I narrowed it down to something around 30 Sep, but can't see
any commits around that date that could have caused it and it has
jumped by more than 10%.

This means adding a few type signature, and some tests failing
(as they should) rather than succeeding

Also some expected/actual messages are now the right way round

We get a reference to memcpy@plt rather than memcpy

dynamic ghci can't load .a files