Fix the 'index.cache' timestamp check.
Fix the 'index.cache' timestamp check.

Since we're using 'unless' here, we should use (>) instead of (>=).

ghc-android/cabal,gridaphobe/cabal,mmakowski/cabal,triplepointfive/cabal,x-y-z/cabal,mydaum/cabal,trskop/cabal,rimmington/cabal,kosmikus/cabal,gridaphobe/cabal,thomie/cabal,bennofs/cabal,ian-ross/cabal,eric-stanley/cabal,anton-dessiatov/cabal,garetxe/cabal,eric-stanley/cabal,trskop/cabal,Peaker/cabal,rimmington/cabal,thoughtpolice/cabal,valderman/cabal,beni55/cabal,edsko/cabal,thomie/cabal,typelead/epm,sopvop/cabal,beni55/cabal,Heather/cabal,plow-technologies/cabal,mightybyte/cabal,seereason/cabal,ghc-android/cabal,fugyk/cabal,triplepointfive/cabal,kolmodin/cabal,themoritz/cabal,lukexi/cabal,fugyk/cabal,enolan/cabal,martinvlk/cabal,anton-dessiatov/cabal,sopvop/cabal,Peaker/cabal,kolmodin/cabal,Helkafen/cabal,plumlife/cabal,plumlife/cabal,themoritz/cabal,christiaanb/cabal,headprogrammingczar/cabal,Heather/cabal,headprogrammingczar/cabal,randen/cabal,valderman/cabal,plow-technologies/cabal,fpco/cabal,fpco/cabal,bennofs/cabal,mydaum/cabal,randen/cabal,x-y-z/cabal,mmakowski/cabal,garetxe/cabal,themoritz/cabal,edsko/cabal,sopvop/cabal,kosmikus/cabal,lukexi/cabal,typelead/epm,enolan/cabal,seereason/cabal,thoughtpolice/cabal,corngood/cabal,mightybyte/cabal,Helkafen/cabal,ian-ross/cabal,gbaz/cabal,christiaanb/cabal,corngood/cabal,martinvlk/cabal,gbaz/cabal