Resolve another Foldable import on GHC 7.8.
Resolve another Foldable import on GHC 7.8.

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