gh-71052: Fix several Android build issues (#115955)

This change is part of the work on PEP-738: Adding Android as a 
supported platform.

* Remove the "1.0" suffix from libpython's filename on Android, which 
  would prevent Gradle from packaging it into an app. 
* Simplify the build command in the Makefile so that libpython always 
  gets given an SONAME with the `-Wl-h` argument, even if the SONAME is
  identical to the actual filename.
* Disable a number of functions on Android which can be compiled and 
  linked against, but always fail at runtime. As a result, the native
  _multiprocessing module is no longer built for Android.
* gh-115390 (bee7bb331) added some pre-determined results to the 
  configure script for things that can't be autodetected when
  cross-compiling; this change adds Android to these where appropriate.
* Add a couple more pre-determined results for Android, and making them 
  cover iOS as well. This means the --enable-ipv6 configure option will 
  no longer be required on either platform.