LibWeb/WebGL+Meta: Stub getSupportedExtensions() and getExtension()

Author: https://github.com/kalenikaliaksandr
Commit: 7e78d7d332
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2688
Reviewed-by: https://github.com/ADKaster ✅

Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateWebGLRenderingContext.cpp

@@ -171,6 +171,11 @@ public:
             continue;
         }
 
+        if (function.name == "getSupportedExtensions"sv || function.name == "getExtension"sv) {
+            // Implemented in WebGLRenderingContext
+            continue;
+        }
+
         StringBuilder function_declaration;
 
         StringBuilder function_parameters;