Allow Auth-User header to be set a REMOTE_USER Env var.

ttrss.nginx.conf

@@ -9,6 +9,7 @@ server {
 	}
 
 	location ~ \.php$ {
+		fastcgi_param REMOTE_USER $HTTP_AUTH_USER;
 		fastcgi_split_path_info ^(.+\.php)(/.+)$;
 		fastcgi_pass unix:/var/run/php5-fpm.sock;
 		fastcgi_index index.php;