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Because of the way wendelin.core organizes its in-tree python importing
redirector (see wendelin.py) it is possible to import the same module
twice with python thinking it is importing two different modules. For
example when installed in develop mode python resolves the following
imports to the same bigfile/__init__.py

    import wendelin.bigfile
    import bigfile

but tries to load that module twice and independently. Which leads to
virtmem DSO, linked to from under bigfile/_bigfile extension, being
initialized twice and complaining about that because only single gil
hook should be requested to be installed:

    (py39.venv) kirr@deca:~/src/wendelin/wendelin.core$ python
    Python 3.9.19+ (heads/3.9:40d77b93672, Apr 12 2024, 06:40:05)
    [GCC 12.2.0] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import wendelin.bigfile
    >>> import bigfile
    python: bigfile/virtmem.c:106: virt_lock_hookgil: Assertion `!(virtmem_gilhooks)...