Hello Arfernando,
The glx module I’m loading is in the xorg-x11-server-Xorg package:
grep libglx.so /var/log/Xorg.0.log
[ 136.547] (II) Loading /usr/lib64/xorg/modules/extensions/libglx.so
rpm -qf /usr/lib64/xorg/modules/extensions/libglx.so
xorg-x11-server-Xorg-1.20.1-5.3.el7_6.x86_64
The original problem I was having appeared to be the result of one of the xorg or mesa packages installing an older version of /usr/lib64/xorg/modules/extensions/libglx.so. Removing and reinstalling all the xorg or mesa packages fixed the problem I has having.