Compile Cython with C++17. (#787)

#741 moved the code base over to C++17, and as discussed in #736 moving Cython compilation over is fine as well but has not been done yet. There's some use of structured bindings in there now (in `cuda_async_memory_resource.hpp`) so the Cython compilation should be switched over as well.

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - GALI PREM SAGAR (https://github.com/galipremsagar)
  - https://github.com/jakirkham
  - Mark Harris (https://github.com/harrism)

URL: #787

python/setup.py

@@ -132,7 +132,7 @@ def get_cuda_version_from_header(cuda_include_dir):
             ],
             libraries=["cuda", "cudart"],
             language="c++",
-            extra_compile_args=["-std=c++14"],
+            extra_compile_args=["-std=c++17"],
         )
     ],
     nthreads=nthreads,