C++: Permit ':' in models-as-data namespaces.

Author: geoffw0

cpp/ql/lib/semmle/code/cpp/dataflow/ExternalFlow.qll

@@ -330,7 +330,7 @@ module CsvValidation {
       or
       summaryModel(namespace, type, _, name, signature, ext, _, _, _, _) and pred = "summary"
     |
-      not namespace.regexpMatch("[a-zA-Z0-9_\\.]*") and
+      not namespace.regexpMatch("[a-zA-Z0-9_\\.:]*") and
       result = "Dubious namespace \"" + namespace + "\" in " + pred + " model."
       or
       not type.regexpMatch("[a-zA-Z0-9_<>,\\+]*") and

cpp/ql/test/library-tests/dataflow/external-models/validatemodels.expected

@@ -1,3 +0,0 @@
-| Dubious namespace "boost::asio" in sink model. |
-| Dubious namespace "boost::asio" in source model. |
-| Dubious namespace "boost::asio" in summary model. |