procd: make rpcd dependency conditional

Avoids building rpcd when not needed

Signed-off-by: Felix Fietkau <[email protected]>

package/system/procd/Makefile

@@ -89,7 +89,7 @@ endef
 define Package/uxc
   SECTION:=base
   CATEGORY:=Base system
-  DEPENDS:=+procd-ujail +libubus +libubox +libblobmsg-json +blockd +rpcd
+  DEPENDS:=+procd-ujail +libubus +libubox +libblobmsg-json +blockd +PACKAGE_uxc:rpcd
   TITLE:=OpenWrt container management
   MAINTAINER:=Daniel Golle <[email protected]>
 endef