fix: update LD_LIBRARY_PATH for crashing python plugins

[frenchwr]

Currently python-based plug-ins (15 in total) are crashing with messages like the following:

Querying plug-in: '/snap/gimp/x2/usr/lib/x86_64-linux-gnu/gimp/3.0/plug-ins/test-file-plug-ins/test-file-plug-ins.py'
GIMP-WARNING: gimp-2.99: gimp_wire_read(): unexpected EOF
Terminating plug-in: '/snap/gimp/x2/usr/lib/x86_64-linux-gnu/gimp/3.0/plug-ins/test-file-plug-ins/test-file-plug-ins.py'
.
.

Specifically, the python plug-ins are seg faulting, which can be seen by shelling into the snap and running a minimum example:

/snap/gimp/x1$ python3
Python 3.12.3 (main, Sep 11 2024, 14:17:37) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import gi
>>> gi.require_version("Gimp", "3.0")
>>> gi.require_version("GimpUi", "3.0")
>>> gi.require_version("Gtk", "3.0")
>>> from gi.repository import Gimp
Segmentation fault (core dumped)

Updating the LD_LIBRARY_PATH resolves this issue by providing the correct libs (those that GIMP are built against) at runtime.

Snapshots after deploying the fix

• 134 plug-ins available from the plug-in browser (compared to 120 previously)

• Python Fu Plugin Menu

• One of the Python plug-ins (Python console) launched from the GIMP menu (Filters -> Development -> Python Fu -> Python Console)

[jnsgruk]

Nice, thanks!