remove broken concatenation for now

lib/css/CssExportsGenerator.js

@@ -26,14 +26,8 @@ class CssExportsGenerator extends Generator {
 		super();
 	}
 
-	/**
-	 * @param {NormalModule} module module for which the bailout reason should be determined
-	 * @param {ConcatenationBailoutReasonContext} context context
-	 * @returns {string | undefined} reason why this module can't be concatenated, undefined when it can be concatenated
-	 */
-	getConcatenationBailoutReason(module, context) {
-		return undefined;
-	}
+	// TODO add getConcatenationBailoutReason to allow concatenation
+	// but how to make it have a module id
 
 	/**
 	 * @param {NormalModule} module module for which the code should be generated