C++: Add another test to namespaces test

Author: ian-semmle

cpp/ql/test/library-tests/namespaces/namespaces/decls.expected

@@ -5,7 +5,9 @@
 | file://:0:0:0:0 | (global namespace) | file://:0:0:0:0 | operator= | __va_list_tag::operator= | false |
 | file://:0:0:0:0 | (global namespace) | file://:0:0:0:0 | overflow_arg_area | __va_list_tag::overflow_arg_area | false |
 | file://:0:0:0:0 | (global namespace) | file://:0:0:0:0 | reg_save_area | __va_list_tag::reg_save_area | false |
+| file://:0:0:0:0 | (global namespace) | namespaces.cpp:42:6:42:18 | globalIntUser | globalIntUser | true |
 | file://:0:0:0:0 | <none> | file://:0:0:0:0 | auto | <none> | false |
+| file://:0:0:0:0 | <none> | namespaces.cpp:40:5:40:13 | globalInt | <none> | true |
 | file://:0:0:0:0 | B | namespaces.cpp:32:7:32:7 | x | B::x | true |
 | namespaces.cpp:11:13:11:13 | C::D | file://:0:0:0:0 | p#0 | <none> | false |
 | namespaces.cpp:11:13:11:13 | C::D | file://:0:0:0:0 | p#0 | <none> | false |

cpp/ql/test/library-tests/namespaces/namespaces/namespaces.cpp

@@ -36,3 +36,9 @@ namespace B {
 namespace std {
 
 }
+
+int globalInt;
+
+void globalIntUser(void) {
+    extern int globalInt;
+}