package/swupdate: prevent systemd from removing swupdate tmp folders

Ensure these folders are excluded from being cleaned up by systemd.

Fixes:
[ERROR] : SWUPDATE failed [0] ERROR : I cannot open /tmp/scripts/format.lua 2
[ERROR] : SWUPDATE failed [0] ERROR : extracting script to /tmp/scripts/ failed
[ERROR] : SWUPDATE failed [1] Installation failed !

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit daa46718e0642a92c59edb166ced1ff1911b0043)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/swupdate/swupdate.mk

@@ -221,6 +221,8 @@ define SWUPDATE_INSTALL_INIT_SYSTEMD
 	$(SWUPDATE_INSTALL_COMMON)
 	$(INSTALL) -D -m 644 package/swupdate/swupdate.service \
 		$(TARGET_DIR)/usr/lib/systemd/system/swupdate.service
+	$(INSTALL) -D -m 644 package/swupdate/tmpfiles-swupdate.conf \
+		$(TARGET_DIR)/usr/lib/tmpfiles.d/tmpfiles-swupdate.conf
 endef
 define SWUPDATE_INSTALL_INIT_SYSV
 	$(SWUPDATE_INSTALL_COMMON)

package/swupdate/tmpfiles-swupdate.conf

@@ -0,0 +1,2 @@
+X /tmp/datadst
+X /tmp/scripts