Move SwigValueWrapper to header section

Recent change to SwigValueWrapper required the <utility> header.
Included headers should be after the include of the language
specific header files (which go into the earlier runtime section).

Testcase required -Winit-list-lifetime warning suppression change
for Perl which somehow lost the warning suppression when put
into the %begin section.

Examples/test-suite/cpp11_initializer_list.i

@@ -10,7 +10,7 @@
   $1 = {"Ab", "Fab"};
 %}
 
-%begin %{
+%runtime %{
 #if __GNUC__ >= 9
 /* warning: ‘new’ of initializer_list does not extend the lifetime of the underlying array [-Winit-list-lifetime] */
 /* incorrect warning for C::C(std::initializer_list<const char *>) */