[3.12] gh-105436: The environment block should end with two null wchar_t values (GH-105495) (#105700)

gh-105436: The environment block should end with two null wchar_t values (GH-105495)
(cherry picked from commit 4f7d3b602d47d61137e82145f601dccfe6f6cd3c)

Co-authored-by: Dora203 <66343334+sku2000@users.noreply.github.com>