eolian: tests for extern struct/typedef not-generation

src/tests/eolian/data/struct.eo

@@ -10,6 +10,10 @@ struct Another {
 /* opaque struct */
 struct Opaque;
 
+struct @extern Not.Generated {
+    field: int;
+}
+
 class Struct {
    methods {
       foo {

src/tests/eolian/data/typedef.eo

@@ -1,6 +1,8 @@
 type Evas.Coord: int; /* Simple type definition */
 type List_Objects: own(list<Eo *>*); /* A little more complex */
 
+type @extern Evas.Pants: float; /* not generated */
+
 enum Enum.Bar
 {
    legacy: bar;

src/tests/eolian/eolian_parsing.c

@@ -398,6 +398,8 @@ START_TEST(eolian_typedef)
    fail_if(!eina_iterator_next(iter, (void**)&atype));
    fail_if(!(type_name = eolian_type_name_get(atype)));
    fail_if(strcmp(type_name, "List_Objects"));
+   /* not generated extern, skip */
+   fail_if(!eina_iterator_next(iter, (void**)&atype));
    fail_if(eina_iterator_next(iter, (void**)&atype));
 
    eolian_shutdown();