selinux: add generated av_permissions.h to targets

av_permissions.h was not declared as a target and therefore not cleaned
up automatically by kbuild.

Suggested-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/lkml/CAK7LNATUnCPt03BRFSKh1EH=+Sy0Q48wE4ER0BZdJqOb_44L8w@mail.gmail.com/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>

Author: t-8ch

security/selinux/Makefile

@@ -33,11 +33,10 @@ $(addprefix $(obj)/,$(selinux-y)): $(obj)/flask.h
 quiet_cmd_genhdrs = GEN     $(addprefix $(obj)/,$(genhdrs))
       cmd_genhdrs = $< $(addprefix $(obj)/,$(genhdrs))
 
-# see the note above, replace the $targets and 'flask.h' rule with the lines
-# below:
-#  targets += $(genhdrs)
+targets += $(genhdrs)
+
+# see the note above, replace the 'flask.h' rule with the line below:
 #  $(addprefix $(obj)/,$(genhdrs)) &: $(obj)/genheaders FORCE
-targets += flask.h
 $(obj)/flask.h: $(obj)/genheaders FORCE
 	$(call if_changed,genhdrs)