Put each assembler function into its own section.

Don't manually place assembler functions into the fixed area - allow
    the layout script to do it.
diff --git a/src/post.c b/src/post.c
index 7093901..c8e0669 100644
--- a/src/post.c
+++ b/src/post.c
@@ -34,10 +34,10 @@
     dprintf(3, "init ivt\n");
-    // Initialize all vectors to a dummy handler.
+    // Initialize all vectors to the default handler.
     int i;
     for (i=0; i<256; i++)
-        set_irq(i, dummy_iret_handler);
+        set_irq(i, entry_iret_official);
     // Initialize all hw vectors to a default hw handler.
     for (i=0x08; i<=0x0f; i++)