[3.10] bpo-44935: enable posix_spawn() on Solaris (GH-27795) (GH-27800)



Enable posix_spawn() on Solaris
(cherry picked from commit b1930bf75f276cd7ca08c4455298128d89adf7d1)


Co-authored-by: Jakub KulĂ­k <Kulikjak@gmail.com>

Automerge-Triggered-By: GH:gpshead
2 files changed