Patches fixing a few test failures

[Daniel Fischer]

I've prepared two patches fixing some test failures.

The first passes '-ignore-dot-ghci' to all tests, not only the ghci way, which 
deals with forgetting to pass the flag when the test is invoked with '--
interactive' from a makefile, as was the case with T8333.

The second removes the now-obsolete pragma setting '-fno-warn-amp' from 
spec001.

I didn't notice the trailing whitespace that was also removed in time, sorry, 
but I hope the clutter from that is not too bad.

Kindly revise the patches, please.
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