Make dprintf the default debugging facility

Makefile

@@ -18,7 +18,7 @@ QEMU_ARGS += --enable-kvm
 endif
 
 ifdef DEBUG
-ROMS += debug.rom
+ROMS += dprintf.rom
 NASM_ARGS += -l $(basename $@).lst
 endif
 
@@ -65,7 +65,7 @@ fate.bs: boot/fat.asm
 	$(NASM) $(NASM_ARGS) -DFAT16 -DLBA -DLARGE -o $@ $<
 
 # BIOS option roms
-%.rom: rom/%.asm %/*.asm utils/fix-rom
+%.rom: rom/%.asm utils/fix-rom
 	$(NASM) $(NASM_ARGS) -o $@ $< && utils/fix-rom $@
 
 fdimage.img: fat1.bs $(DISTFILES)