fixes for gcc-4.0 interpretation of the C++ standard - anonymous declarations cannot have external C++ linkage.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@7181 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/test-suite/cpp_enum.i

@@ -35,6 +35,7 @@ struct StructWithEnums {
    }
  };
 
+extern "C"
  enum {Hi, Hello } hi;
 
 %}

SWIG/Examples/test-suite/enum_thorough.i

@@ -461,7 +461,9 @@ struct Obscure {
 };
 
 // Unnamed enum instance
+extern "C" {
 enum { globalinstance1, globalinstance2, globalinstance3 = 30 } GlobalInstance;
+}
 
 struct Instances {
   enum { memberinstance1, memberinstance2, memberinstance3 = 300 } MemberInstance;