[3.14] gh-146444: Don't package as part of iOS 'build hosts' target (GH-146628) (#146629)

gh-146444: Don't package as part of iOS 'build hosts' target (GH-146628)

* Revert Py3.9 compatibility fixes.
* Only build the package on 'build all'.
(cherry picked from commit 6420847bdaa945fb13251d3f93968946c0f3444f)

Co-authored-by: Russell Keith-Magee <russell@keith-magee.com>