Update futhark-mode.el to the new tuple syntax.
Update futhark-mode.el to the new tuple syntax.

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