fix DotCFG.hpp to compile with gcc 4.8.5
fix DotCFG.hpp to compile with gcc 4.8.5

HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit