Whitelist cppcms links
Their website has been unreachable for a whole day and it is unknown
when it will be back online.
@@ -13,3 +13,9 @@ https://webdemo.libelektra.org
https://debian-stretch-repo.libelektra.org
https://crates.io/crates/elektra
https://crates.io/crates/elektra-sys
+
+# cppcms website has been down for quite a while for unknown reasons
+http://cppcms.com
+http://cppcms.com/wikipp/en/page/apt
+http://cppcms.com/wikipp/en/page/cppcms_1x_config
+http://cppcms.com/wikipp/en/page/cppcms_1x_build
