procd: Install hotplug files as 600

procd runs as root, so it only makes sense that its files are restricted.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

package/system/procd/Makefile

@@ -8,10 +8,10 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=procd
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL=$(PROJECT_GIT)/project/procd.git
+PKG_SOURCE_URL:=$(PROJECT_GIT)/project/procd.git
 PKG_SOURCE_DATE:=2018-08-06
 PKG_SOURCE_VERSION:=e29966f04cdf549a01f721f93634672055da8af4
 PKG_MIRROR_HASH:=f02b74df25025b0299181f9ed03aa04092c00a047f5976d91305a0e98c132829
@@ -99,7 +99,7 @@ define Package/procd/install
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/{init,procd,askfirst,udevtrigger,upgraded} $(1)/sbin/
 	$(INSTALL_DATA) $(PKG_INSTALL_DIR)/usr/lib/libsetlbf.so $(1)/lib
 	$(INSTALL_BIN) ./files/reload_config $(1)/sbin/
-	$(INSTALL_DATA) ./files/hotplug*.json $(1)/etc/
+	$(INSTALL_CONF) ./files/hotplug*.json $(1)/etc/
 	$(INSTALL_DATA) ./files/procd.sh $(1)/lib/functions/
 endef