Trivial ghc-7.6 update

[michaelt]

This and the data-inttrie patch take account of the weaker Bits class in more recent base. The errors in data-intrie mostly come from numeric literals so they could be handled in other ways e.g. by wrapping the literals in 'bit 0', 'bit 1' etc. http://stackoverflow.com/questions/12560619/bits-is-not-derived-from-num

[luqui]

Already merged from another request. Thanks though!