corrected unrool -> unroll in sssp_enactor.cuh
corrected unrool -> unroll in sssp_enactor.cuh

anshumang/gunrock-swched-swmm,anshumang/gunrock-swched-swmm,anshumang/gunrock-swched-swmm,anshumang/gunrock-swched-swmm,anshumang/gunrock-swched-swmm