libs.sh modernization, examples cleanup

Author: dimitre

.github/workflows/of.yml

@@ -52,9 +52,10 @@ jobs:
             ninja-build
             libfontconfig1-dev
             libxrandr-dev
+            libglu1-mesa-dev libgl1-mesa-dev
             libjack-jackd2-0 libjack-jackd2-dev libasound2-dev
             freeglut3-dev libxmu-dev libxxf86vm-dev libopenal-dev libsndfile1-dev libpulse-dev
-            libgl1-mesa-dev libudev-dev libdrm-dev
+            libudev-dev libdrm-dev
             libxcursor-dev libxi-dev libxinerama-dev
             libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev gstreamer1.0-pulseaudio
             gstreamer1.0-x gstreamer1.0-plugins-bad gstreamer1.0-alsa