Fix test_embed.test_pre_initialization_sys_options() env vars (GH-14172)


test_pre_initialization_sys_options() of test_embed now removes
PYTHON* environment variables like PYTHONWARNINGS.
(cherry picked from commit dbdc991a62bc2b3393d287e90292e3603f47d98a)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
1 file changed