I just released a new RA 8.170.9 version including those missing libs, I tried it out and it worked in a fresh new LE9 alpha build installation.
You can update from kodi's Gamestarter repo or download zip from here: game.retroarch-8.170.9.zip
Also, I tried to get new RA 1.7.3 binary from escalade's/5schatten's releases but I can not make it work in official LE build... Since nowadays I just use my RPi for hyperion/ambilight control (and twice a month to watch some downloaded movies) by the moment 1.7.0 will be the last RA version in gamestarter addon, unless someone offers itself to compile RA using official LE toolchain... sorry...
Brilliant! Now I can start RetroArch. It's really cool. Thank you very much!!!
Now I have another problem. This time it's Advanced Emulator Launcher. I don't understand how I have to configure this. I read the read me in github but don't know what I have to do exactly. I could configure RetroArch, but don't know which configuration file I have to import in ALE? Can someone explain me what I have to do here?