TBB - g++-10 compatibility

tbb.txt

In file included from /home/giannis/nwgraph/NWGraph/test/compat_eg.cpp:21:
/home/giannis/nwgraph/NWGraph/include/nwgraph/compat.hpp:17:2: warning: #warning "compat.hpp is deprecated" [-Wcpp]
   17 | #warning "compat.hpp is deprecated"
      |  ^~~~~~~
[ 32%] Linking CXX executable tag_invoke_eg.exe
In file included from /usr/include/c++/10/pstl/parallel_backend.h:16,
                 from /usr/include/c++/10/pstl/algorithm_impl.h:22,
                 from /usr/include/c++/10/pstl/glue_execution_defs.h:50,
                 from /usr/include/c++/10/execution:32,
                 from /home/giannis/nwgraph/NWGraph/include/nwgraph/util/proxysort.hpp:25,
                 from /home/giannis/nwgraph/NWGraph/test/proxysort_eg.cpp:18:
/usr/include/c++/10/pstl/parallel_backend_tbb.h: In function ‘void __pstl::__par_backend::__cancel_execution()’:
/usr/include/c++/10/pstl/parallel_backend_tbb.h:70:10: error: ‘tbb::task’ has not been declared
   70 |     tbb::task::self().group()->cancel_group_execution();
      |          ^~~~