Keep relocated 16bit code so checkstack can use it.

Make was stripping the relocated 16bit code - keep the unstripped
    16bit code so that checkstack can parse it.
diff --git a/Makefile b/Makefile
index 3a4a1e9..bd5c184 100644
--- a/Makefile
+++ b/Makefile
@@ -119,8 +119,8 @@
 
 $(OUT)rom.o: $(OUT)rom16.o $(OUT)rom32.o $(OUT)rombios16.lds $(OUT)rombios.lds
 	@echo "  Linking $@"
-	$(Q)$(LD) -T $(OUT)rombios16.lds $(OUT)rom16.o -R $(OUT)rom32.o -o $(OUT)rom16.final.o
-	$(Q)$(STRIP) $(OUT)rom16.final.o
+	$(Q)$(LD) -T $(OUT)rombios16.lds $(OUT)rom16.o -R $(OUT)rom32.o -o $(OUT)rom16.reloc.o
+	$(Q)$(STRIP) $(OUT)rom16.reloc.o -o $(OUT)rom16.final.o
 	$(Q)$(OBJCOPY) --extract-symbol --adjust-vma 0xf0000 $(OUT)rom16.o $(OUT)rom16.moved.o
 	$(Q)$(LD) -T $(OUT)rombios.lds $(OUT)rom16.final.o $(OUT)rom32.o -R $(OUT)rom16.moved.o -o $@