x86/boot/build: Make 'make bzlilo' not depend on vmlinux or $(obj)/bzImage

bzlilo is an installation target because it copies files to
$(INSTALL_PATH)/, then runs 'lilo'. However, arch/x86/Makefile and
arch/x86/boot/Makefile have it depend on vmlinux and $(obj)/bzImage,
respectively.

'make bzlilo' may update some build artifacts in the source tree.

As commit

  19514fc6 ("arm, kbuild: make "make install" not depend on vmlinux")

explained, this should not happen.

Make 'bzlilo' not depend on any build artifact.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200215063852.8298-1-masahiroy@kernel.org

arch/x86/Makefile

@@ -246,7 +246,7 @@ drivers-$(CONFIG_FB) += arch/x86/video/
 
 boot := arch/x86/boot
 
-BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
+BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 isoimage
 
 PHONY += bzImage $(BOOT_TARGETS)
 
@@ -267,8 +267,8 @@ endif
 $(BOOT_TARGETS): vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $@
 
-PHONY += install
-install:
+PHONY += install bzlilo
+install bzlilo:
 	$(Q)$(MAKE) $(build)=$(boot) $@
 
 PHONY += vdso_install

arch/x86/boot/Makefile

@@ -145,7 +145,7 @@ isoimage: $(obj)/bzImage
 	$(call cmd,genimage,isoimage,$(obj)/image.iso)
 	@$(kecho) 'Kernel: $(obj)/image.iso is ready'
 
-bzlilo: $(obj)/bzImage
+bzlilo:
 	if [ -f $(INSTALL_PATH)/vmlinuz ]; then mv $(INSTALL_PATH)/vmlinuz $(INSTALL_PATH)/vmlinuz.old; fi
 	if [ -f $(INSTALL_PATH)/System.map ]; then mv $(INSTALL_PATH)/System.map $(INSTALL_PATH)/System.old; fi
 	cat $(obj)/bzImage > $(INSTALL_PATH)/vmlinuz