[Agda] Agda compile failure on GHC 7.4

[Dominique Devriese]

A student of mine signals that the current Agda code does not compile
on GHC 7.4.  The culprit seems to be the dependency on directory 1.2.*
in Agda.cabal. This package does not currently compile on GHC 7.4 (see
also the build failure log on its hackage page).

I propose the attached patch which makes Agda use v1.1.* of the
directory package on GHC 7.4.  I have not tested with GHC 7.6. Can
this (or an alternative fix) please be committed?

Thanks in advance,
Dominique
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