[Agda] Avoid GHC 6.10.1 (for now)

[Nils Anders Danielsson]

Hi,

If you compile Agda using GHC 6.10.1, then you can expect drastic
slowdowns (as compared to GHC 6.8.3). Loading the standard library, when
everything is already type-checked, can take roughly ten times longer if
you use 6.10.1.

I don't know the reason for this slowdown, but my hunch is that there is
some optimisation of the binary library which is not triggered properly
by the new compiler. Perhaps this will be fixed by a future version of
binary.

-- 
/NAD


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