[PATCH] Change 'whenCacheOutOfDate' to use '>' again.

[Nikita Karetnikov]

As some of you may know, I’m trying to make ‘cabal install’ verify
OpenPGP signatures that come from Hackage.  I modified
‘updatePackageIndexCacheFile’ to ask whether a certain OpenPGP public
key should be trusted, but I later discovered that the mentioned
function is called twice during ‘cabal update’*, which means that all
questions are also asked twice.

I believe this doesn’t affect #1443 anymore.  If so, please apply the
attached patch.

* ‘update’ uses ‘updateRepo’ and ‘checkForSelfUpgrade’.  The former runs
  ‘updatePackageIndexCacheFile’ via ‘updateRepoIndexCache’.  The latter
  calls ‘updatePackageIndexCacheFile’ via a sequence of calls from
  ‘getSourcePackages’ to ‘getSourcePackages’’ to ‘readRepoIndex’ to
  ‘whenCacheOutOfDate’.

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