Compat: Check for successful GLEW initialisation fails on my PC / Trixie

I observed same strange behaviour already last year on my »Video Output« talk.
The return value indicates an unkown error, but the subsequent usage seemingly works...

On my Laptop, I don not see this error; it might be due to the very old graphics card on my PC...

FrOSCon26/examples/egl-display.hpp

@@ -183,9 +183,10 @@ EglDisplay<PIX,WIDTH,HEIGHT>::openDisplay (Gtk::Window& appWindow)
 
   // use lib-GLEW to manage OpenGL extensions (notably GL Shader Language)
   GLenum glewErr = glewInit();
-  if (GLEW_OK != glewErr)
-    __FAIL ("could not bind OpenGL extensions through lib-GLEW:\n"
-           +string{reinterpret_cast<const char*> (glewGetErrorString(glewErr))});
+////////////////////////////////////////////////////////////////////////////////////TODO for some reason I get glewErr == 4 ("unknown error"), but it works non the less
+//if (GLEW_OK != glewErr)
+//  __FAIL ("could not bind OpenGL extensions through lib-GLEW:\n"
+//         +string{reinterpret_cast<const char*> (glewGetErrorString(glewErr))});
 
 
   auto compileShader = [](GLenum kind, string code)