tomoyo: fix broken dependency on *.conf.default

If *.conf.default is updated, builtin-policy.h should be rebuilt,
but this does not work when compiled with O= option.

[Without this commit]

  $ touch security/tomoyo/policy/exception_policy.conf.default
  $ make O=/tmp security/tomoyo/
  make[1]: Entering directory '/tmp'
    GEN     Makefile
    CALL    /home/masahiro/ref/linux/scripts/checksyscalls.sh
    DESCEND objtool
  make[1]: Leaving directory '/tmp'

[With this commit]

  $ touch security/tomoyo/policy/exception_policy.conf.default
  $ make O=/tmp security/tomoyo/
  make[1]: Entering directory '/tmp'
    GEN     Makefile
    CALL    /home/masahiro/ref/linux/scripts/checksyscalls.sh
    DESCEND objtool
    POLICY  security/tomoyo/builtin-policy.h
    CC      security/tomoyo/common.o
    AR      security/tomoyo/built-in.a
  make[1]: Leaving directory '/tmp'

$(srctree)/ is essential because $(wildcard ) does not follow VPATH.

Fixes: f02dee2d14 ("tomoyo: Do not generate empty policy files")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>

security/tomoyo/Makefile

@@ -10,7 +10,7 @@ endef
 quiet_cmd_policy  = POLICY  $@
       cmd_policy  = ($(call do_policy,profile); $(call do_policy,exception_policy); $(call do_policy,domain_policy); $(call do_policy,manager); $(call do_policy,stat)) >$@
 
-$(obj)/builtin-policy.h: $(wildcard $(obj)/policy/*.conf $(src)/policy/*.conf.default) FORCE
+$(obj)/builtin-policy.h: $(wildcard $(obj)/policy/*.conf $(srctree)/$(src)/policy/*.conf.default) FORCE
 	$(call if_changed,policy)
 
 $(obj)/common.o: $(obj)/builtin-policy.h