Add deprecation warning

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

lib/public/AppFramework/Http/EmptyContentSecurityPolicy.php

@@ -110,6 +110,7 @@ class EmptyContentSecurityPolicy {
 	 * @param bool $state
 	 * @return $this
 	 * @since 8.1.0
+	 * @deprecated Eval should not be used anymore. Please update your scripts. This function will stop functioning in a future version of Nextcloud.
 	 */
 	public function allowEvalScript($state = true) {
 		$this->evalScriptAllowed = $state;