Avoid checking for readline in non-CLI contexts, fixes #8909

src/Composer/Autoload/AutoloadGenerator.php

@@ -608,7 +608,7 @@ EOF;
                     }
 
                     $extension = var_export($match[1], true);
-                    if ($match[1] === 'pcntl') {
+                    if ($match[1] === 'pcntl' || $match[1] === 'readline') {
                         $requiredExtensions[$extension] = "PHP_SAPI !== 'cli' || extension_loaded($extension) || \$missingExtensions[] = $extension;\n";
                     } else {
                         $requiredExtensions[$extension] = "extension_loaded($extension) || \$missingExtensions[] = $extension;\n";