dwt/loader: COFF loader places GSPLNK images and runs them via create_process

dwt/loader/rel_b.asm

@@ -0,0 +1,10 @@
+; rel_b.asm -- reldemo callee/data: ext_func and ext_data are defined here.
+	.def	ext_func
+	.def	ext_data
+	.text
+ext_func:
+	rets
+	.data
+ext_data:
+	.long	0CAFEBABEh
+	.end