[3.14] gh-131591: Make --without-remote-debug work (GH-135925) (GH-135931)

gh-131591: Make --without-remote-debug work (GH-135925)

The feature is checked using `defined(Py_REMOTE_DEBUG)`; defining
the macro (even as `0`) enables it.
(cherry picked from commit c2f2fd4eca3b342e781355f9b9e716827fc81a5b)

Co-authored-by: Petr Viktorin <encukou@gmail.com>