Remove unused parameters from distributed kernels.
Remove unused parameters from distributed kernels.

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