Migrate from deprecated distutils.sysconfig in scripts

[XVilka]

Python module distutils.sysconfig was deprecated via PEP-632 since Python 3.10 and will be removed in 3.12. The recommended alternative to use the sysconfig module. Instead of get_python_lib() the recommended alternative is get_path('purelib').

• https://www.python.org/dev/peps/pep-0632/
• https://docs.python.org/3/distutils/apiref.html#module-distutils.sysconfig
• https://docs.python.org/3/library/sysconfig.html#module-sysconfig
• https://bugs.gentoo.org/794166

Tested with Python 3.10 on Fedora 35 x86_64

[XVilka]

Only MacOS with OCaml bindings build fails, not sure why - I don't have a MacOS system:

Starting: CmdLine
==============================================================================
Task         : Command line
Description  : Run a command line script using Bash on Linux and macOS and cmd.exe on Windows
Version      : 2.182.0
Author       : Microsoft Corporation
Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/command-line
==============================================================================
Generating script.
========================== Starting Command Output ===========================
/bin/bash --noprofile --norc /Users/runner/work/_temp/9dd6c435-b27a-4dc7-b380-b8e712bc8c9a.sh
ocamlfind ocamlopt -package zarith  -linkall -shared -o api/ml/z3ml.cmxs -I . -I api/ml api/ml/z3ml.cmxa
install_name_tool -id $(ocamlfind printconf path)/stublibs/libz3.dylib libz3.dylib
install_name_tool -change libz3.dylib $(ocamlfind printconf path)/stublibs/libz3.dylib api/ml/dllz3ml.so
Z3 was successfully built.
Z3Py scripts can already be executed in the 'build/python' directory.
Z3Py scripts stored in arbitrary directories can be executed if the 'build/python' directory is added to the PYTHONPATH environment variable and the 'build' directory is added to the DYLD_LIBRARY_PATH environment variable.
Use the following command to install Z3 at prefix /Library/Frameworks/Python.framework/Versions/2.7.
    sudo make install
ocamlfind ocamlc -o  ml_example_shared.byte -thread -package z3 -linkpkg  ../examples/ml/ml_example.ml
ocamlfind ocamlc -custom -o  ml_example_shared_custom.byte -thread -package z3 -linkpkg  ../examples/ml/ml_example.ml
ocamlfind ocamlopt -o  ml_example_shared -thread -package z3 -linkpkg  ../examples/ml/ml_example.ml
File "../examples/ml/ml_example.ml", line 1:
Error: The file ../examples/ml/ml_example.cmo is not a bytecode object file
make: *** [ml_example_shared_custom.byte] Error 2
make: *** Waiting for unfinished jobs....
ld: warning: directory not found for option '-L/opt/local/lib'
##[error]Bash exited with code '2'.
Finishing: CmdLine

But the error looks exactly like the one on master branch: https://dev.azure.com/Z3Public/Z3/_build/results?buildId=2799&view=logs&j=60487b59-e8f4-5a1c-7805-8cc27f5a1dc1&t=88468735-7057-5663-2ef3-5b1d70f9f872

[NikolajBjorner]

build failure is orthogonal to your change.