The library could not be loaded which prevented autoresizing
when using the VMSVGA adapter.

VMSGVA is recommended by virtualbox for Linux clients.
Compared to VBoxVGA and VBoxSVGA it also supports 3D acceleration.

Adding the driver makes nixos work with all three supported graphics card
types.

Virtualbox recommends VMSVGA for Linux guests.

It is also currently the only one supporting 3D acceleration
and it works out of the box with NixOS and auto screen resizing.

GIMP uses python interpreter specified in pygimp.interp file for running Python plug-ins,
so any Python related wrapping is useless. It will pick up and use the python from build PATH.

Let’s use a python environment containing pygtk, which is needed by many plug-ins.

Closes: NixOS/nixpkgs#87883

The E (extension) line in pygimp.interp prints the following warnings:

GIMP-Warning: Bad interpreter referenced in interpreter file /nix/store/5c91dah385gn70blsn6i5rzncqj3ks0y-gimp-with-plugins-2.10.18/lib/gimp/2.0/interpreters/pygimp.interp: python2
GIMP-Warning: Bad binary format string in interpreter file /nix/store/5c91dah385gn70blsn6i5rzncqj3ks0y-gimp-with-plugins-2.10.18/lib/gimp/2.0/interpreters/pygimp.interp

This means that the py extension will not be registered when python2 is not in PATH. To prevent this, let’s hardcode the absolute python2 path.

NixOS/nixpkgs#60937 (comment)

Closes: NixOS/nixpkgs#60937