test: force c++11 for cmake build of attach_file_mini too
test: force c++11 for cmake build of attach_file_mini too

StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion