dwt-linux simple example execution error

[GeraldK]

I have exactly the same problem here. I checked the class_size values used in
Display.d and it seems that there is a constant difference of 4 compared with the
values returned by this C-Code:

GTypeQuery query;
g_type_query(GTK_TYPE_XXX, &query);
printf("Class size: %d\n", query.class_size);


Here are the exact values:

GtkFixed: 824 C and 820 D
GtkCellRendererText: 264 C and 260 D
GtkCellRendererPixbuf: 256 C and 260 D
GtkCellRendererToggle: 264 C and 264 D

I don't know if this is of any use, but I'm willing to help in making dwt runnable
with gdc and x64 :)