Well you fixed nothing but you did what I suggested days ago. You've built LE without the Nvidia driver packages and surprisingly it works now...
i think you missed the part where I HAD ALREADY DONE THAT AND XORG-NVIDIA-LEGACY.CONF WAS STILL THERE
REMEMBER HOW I SAID THE DRIVER .KO WASNT EVEN THERE
yeaaaahh... its called readdddiiiinngggg.
see, as an adult, i can troubleshoot things but at some point it becomes a basement dwelling coder with no life's job to fix it.
i had to find, cat and grep through all the build files for mentions of xorg-nvidia-legacy.conf and comment them out/ remove them manually. dirty as fudge, but it worked. also. i expected the right libglx to be loaded by xorg-radeon.conf. which it did... so yea. great LE build. jerk.
you make one popular libreelec build and you get a bit of an attitude huh.