Fix improper lazy IO use
Fix improper lazy IO use

Make `getPrologue` force `parseParas dflags str` before returning. Without this, it will attempt to read from the file after it is closed, with unspecified and generally bad results.
Acidburn0zzz/haddock,Helkafen/haddock,sboosali/haddock,mrBliss/haddock,adamse/haddock,JPMoresmau/haddock,beni55/haddock,Helkafen/haddock,mrhania/haddock,Mistuke/haddock,adamse/haddock,Acidburn0zzz/haddock,adamse/haddock,esmolanka/haddock,Mistuke/haddock,niteria/haddock,beni55/haddock,niteria/haddock,Mistuke/haddock,jstolarek/haddock,Acidburn0zzz/haddock,Helkafen/haddock,beni55/haddock,esmolanka/haddock,randen/haddock,randen/haddock,haskell/haddock,mrBliss/haddock,haskell/haddock,idontgetoutmuch/haddock,lamefun/haddock,randen/haddock,Fuuzetsu/haddock,lamefun/haddock,Fuuzetsu/haddock,niteria/haddock,sboosali/haddock,Fuuzetsu/haddock,idontgetoutmuch/haddock,lamefun/haddock,haskell/haddock,mrBliss/haddock,haskell/haddock,mrhania/haddock,sboosali/haddock,esmolanka/haddock,JPMoresmau/haddock,haskell/haddock,Fuuzetsu/haddock,JPMoresmau/haddock,jstolarek/haddock,mrhania/haddock,idontgetoutmuch/haddock