vim_configurable: restore python derivation overriding

In the current Vim, the Python support can be implemented by linking to
the Python library, e.g., lib/libpython3.8.dylib on darwin.  The
previous workaround of wrapping Vim to prefix $PATH is not sufficient
anymore.  Since in the current Vim, the Python interpreter is no longer
invoked, but instead, the dynamically linked library is used, in which
only the original Python modules are loaded, causing plugins to fail
to load their required Python modules.

Experiments show that, however, it is controlled by the $NIX_PYTHONPATH
environment variable.  In this commit, we add the required environment
variable to the wrapped Vim workaround as previously proposed.  So that
the Vim plugins can use Python modules in the specified Python derivation.

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