bpo-32280: Store _PyRuntime in a named section (GH-4802) (#27448)

This commit stores the _PyRuntime structure in a section of the same name. This allows a debugging or crash reporting tool to quickly locate this structure at runtime without requiring the symbol table.

Co-authored-by: Pablo Galindo <pablogsal@gmail.com>
(cherry picked from commit 35002aa8f62dda1f79035e9904abdf476683e9be)

Co-authored-by: Max Bélanger <aeromax@gmail.com>

Co-authored-by: Max Bélanger <aeromax@gmail.com>