Add missing Control.Applicative import.
Add missing Control.Applicative import.

diku-dk/futhark,CulpaBS/wbBach,diku-dk/futhark,ihc/futhark,ihc/futhark,ihc/futhark,mrakgr/futhark,mrakgr/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,mrakgr/futhark,HIPERFIT/futhark,HIPERFIT/futhark,HIPERFIT/futhark