Fix array of string properties.

And probably other non-nullable array properties.

Tests already exists but the bug was hidden by the existence
of a setter method that was overwriting the buggy property setter
method.

ecr/property.ecr

@@ -2,6 +2,7 @@
     def <%= to_call(prop.name) %>=(value : <%= prop_type_name %>) : <%= prop_type_name %>
       <% if prop.type_info.array? -%>
         # handle array
+        unsafe_value = value.to_a.map(&.to_unsafe).to_unsafe
       <% else -%>
         unsafe_value = value
       <% end %>

spec/libtest/test_subject.c

@@ -27,6 +27,8 @@ static void test_subject_iface_interface_init(TestIfaceInterface* iface) {
 G_DEFINE_TYPE_WITH_CODE(TestSubject, test_subject, G_TYPE_OBJECT,
                         G_ADD_PRIVATE(TestSubject) G_IMPLEMENT_INTERFACE(TEST_TYPE_IFACE, test_subject_iface_interface_init))
 
+void test_subject_set_str_list(TestSubject* self, const char** list);
+
 typedef enum {
   PROP_STRING = 1,
   PROP_BOOLEAN,

spec/libtest/test_subject.h

@@ -105,14 +105,6 @@ void test_subject_set_simple_func(TestSubject* self, TestSubjectSimpleFunc func,
  */
 gboolean test_subject_call_simple_func(TestSubject* self, int number);
 
-/**
- * test_subject_set_str_list:
- * @list: (array zero-terminated=1):
- *
- * Setter for str_list property.
- */
-void test_subject_set_str_list(TestSubject* self, const char** list);
-
 /**
  * test_subject_may_return_null:
  * @return_nil: