Changes for building Python 3.11

Update regen.sh
Actually build Python and copy the frozen modules into android/Python
Use regen.sh to update *.bp files, etc.

Bug: 278602456
Change-Id: Ie3d972edf6246ad9246c846685ef18a548d49077
Test: prebuilts/build-tools/build-prebuilts.sh and also build py3-cmd on build-tools for Mac
43 files changed