[3.12] gh-79382: Fix recursive glob() with trailing "**" (GH-115134) (GH-115290)

Trailing "**" no longer allows to match files and non-existing paths in
recursive glob().
(cherry picked from commit aeffc7f8951e04258f0fd8cadfa6cd8b704730f6)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>