cmake H5_HAVE_VSNPRINTF examples

szcom/rnnlib hdf5_snap/config/cmake/ConfigureChecks.cmake :668 

CHECK_FUNCTION_EXISTS (vsnprintf         H5_HAVE_VSNPRINTF)

szcom/rnnlib hdf5_snap/config/cmake/ConfigureChecks.cmake :672 

endif (H5_HAVE_VSNPRINTF)