Compilation of directory package on GHC 7.4

[Dominique Devriese]

Dear maintainers,

The directory package is currently not compiling on GHC 7.4, leading
to a compile failure of packages that depend on it. Hackage has a
build failure log for GHC 7.4.  I propose the attached patch, although
I have not tested it on GHC 7.6.  Can this (or an alternative fix)
please be considered?

Thanks in advance,
Dominique Devriese
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