dll is for Windows and .so is for Linux
Location to put Binaries
Windows
C:\Users\USERNAME\AppData\Local\gegl-0.4\plug-ins
Linux
/home/(USERNAME)/.local/share/gegl-0.4/plug-ins
Linux (Flatpak)
/home/(USERNAME)/.var/app/org.gimp.GIMP/data/gegl-0.4/plug-ins
Source Code
For some reason the auto Github generated source code of this filter is outdated. So please use the updated source code I provided here named source_code_of_ssg.zip