Build error when cmake option KR_ENABLE_TRACING is ON

[pkestene]

/home/kestenerp/install/kokkos/github/kokkos-resilience-pk/src/resilience/veloc/VelocBackend.cpp: In member function ‘void KokkosResilience::VeloCFileBackend::checkpoint(const string&, int, const std::vector<KokkosResilience::BasicViewHolder<false> >&)’:
/home/kestenerp/install/kokkos/github/kokkos-resilience-pk/src/resilience/veloc/VelocBackend.cpp:340:82: error: ‘m_context’ was not declared in this scope; did you mean ‘make_context’?
  340 |       auto write_trace = Util::begin_trace< Util::TimingTrace< std::string > >( *m_context, "write" );
      |                                                                                  ^~~~~~~~~
      |                                                                                  make_context

Apparently, class VeloCFileBackend should store a "ContextBase *m_context" member to solve this.