Importer fixes

[mhsmith]

• Closes Handle auditwheel-style bundling of non-Python libraries #1383
• Closes numpy.ctypeslib.load_library and other common ctypes usages require the library file to already exist #892
• Closes Using RTLD_GLOBAL in the importer may prevent loading multiple versions of the same library #728

[mhsmith]

I tested the current versions all of the Python 3.10 packages in the repository on ARM64, except for those marked as obsolete in #1039, or variants excluded by the script in release/README.md. Based on the the top packages list attached to #1427, here they are in order of popularity:

numpy cryptography cffi pandas aiohttp yarl multidict frozenlist greenlet pillow grpcio psutil scipy lxml regex pynacl scikit-learn bcrypt matplotlib zstandard google-crc32c kiwisolver contourpy ruamel-yaml-clib pyzmq shapely pycryptodome brotli lz4 zope-interface pycryptodomex argon2-cffi-bindings sentencepiece opencv-python gevent ujson statsmodels scikit-image spacy bitarray thinc blis marisa-trie cymem murmurhash srsly preshed pyproj pywavelets pycares soundfile soxr gensim cytoolz pycurl astropy pycocotools editdistance pyerfa netifaces igraph wordcloud ephem lru-dict pyzbar lameenc tgcrypto qutip photutils depthai miniaudio aubio jpegio

All of them passed with this PR, although the following required a special configuration:

• wordcloud: requires an older version of pillow
• soundfile and pyzbar – need to be pinned (#1417)

[mhsmith]

On Python 3.13, I also checked a couple of official wheels from PyPI. The only one we have a test script for so far is pyzmq, and I also did a manual test of pybase64. Both of them worked OK.

[mhsmith]

Performance test procedure from release/performance.md shows no significant change in speed, and an acceptably small increase in size.

                             First run         Second run
                           Startup   Test    Startup   Test    App MB    Data MB
master (32472815)             0.58   1.67       0.55   1.03      98.2       83.4
This PR (4918e1dd)            0.61   1.66       0.54   1.04      98.2       88.6