Hi,
I assume PKG_ADDON_PROJECTS variable in package.mk files tells limitations on platforms to be used for a specific addon.
So all the other addons which does not have PKG_ADDON_PROJECTS variable in package.mk file are
Code
/LibreELEC.tv/packages$ grep -r PKG_ADDON_PROJECTS *
addons/tools/rpi-tools/package.mk:PKG_ADDON_PROJECTS="RPi RPi2"
addons/service/dispmanx_vnc/package.mk:PKG_ADDON_PROJECTS="RPi RPi2"
addons/service/docker/package.mk:PKG_ADDON_PROJECTS="Generic RPi RPi2"
addons/service/spotify-connect-web/package.mk:PKG_ADDON_PROJECTS="RPi2"
mediacenter/kodi-binary-addons/audiodecoder.usf/package.mk:PKG_ADDON_PROJECTS="Generic Nvidia_Legacy RPi2 imx6 WeTek_Play"