Remove unused import.
Remove unused import.

diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,HIPERFIT/futhark,ihc/futhark,ihc/futhark,ihc/futhark,HIPERFIT/futhark,diku-dk/futhark