[3.14] gh-131531: Android test fixes (GH-136845) (#136962)

Modifies the test runner script to no longer export the the HOST environment
variable, and to allow for tests that produce no Python output (output from the
Android console is still expected and required). These changes stem from
knowledge gained during developing a PR for Android support in cibuildwheel.
(cherry picked from commit 149bddcc216a398d71ec9497e9bf3ec03d6f2914)

Co-authored-by: Malcolm Smith <smith@chaquo.com>