regent: update embed example to pull CXXFLAGS from the environment
regent: update embed example to pull CXXFLAGS from the environment

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