selinux: move genheaders to security/selinux/

This tool is only used in security/selinux/Makefile.

Move it to security/selinux/ so that 'make clean' can clean it up.

Please note 'make clean' does not clean scripts/ because tools under
scripts/ are often used for external module builds. Obviously, genheaders
is not the case here.

Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Paul Moore <[e-mail]>

scripts/remove-stale-files

···
 # yard. Stale files stay in this file for a while (for some release cycles?),
 # then will be really dead and removed from the code base entirely.
 
+# moved to security/selinux/genheaders
+rm -f scripts/selinux/genheaders/genheaders
+
 rm -f *.spec
 
 rm -f lib/test_fortify.log

scripts/selinux/Makefile

···
 # SPDX-License-Identifier: GPL-2.0-only
-subdir-y := mdp genheaders
+subdir-y := mdp

scripts/selinux/genheaders/.gitignore

···
-# SPDX-License-Identifier: GPL-2.0-only
-genheaders

scripts/selinux/genheaders/Makefile

···
-# SPDX-License-Identifier: GPL-2.0
-hostprogs-always-y += genheaders
-HOST_EXTRACFLAGS += -I$(srctree)/security/selinux/include

security/selinux/.gitignore

···
 # SPDX-License-Identifier: GPL-2.0-only
 av_permissions.h
 flask.h
+/genheaders

security/selinux/Makefile

···
 # see the note above, replace the $targets and 'flask.h' rule with the lines
 # below:
 #  targets += $(genhdrs)
-#  $(addprefix $(obj)/,$(genhdrs)) &: scripts/selinux/...
+#  $(addprefix $(obj)/,$(genhdrs)) &: $(obj)/genheaders FORCE
 targets += flask.h
-$(obj)/flask.h: scripts/selinux/genheaders/genheaders FORCE
+$(obj)/flask.h: $(obj)/genheaders FORCE
 	$(call if_changed,genhdrs)
+
+hostprogs := genheaders
+HOST_EXTRACFLAGS += -I$(srctree)/security/selinux/include