dnsmasq: require busybox pidof applet

The dnsmasq init script uses pidof, but BusyBox may be built
without it. Add a Kconfig dependency on BUSYBOX_CONFIG_PIDOF
to ensure the applet is available at runtime.

Signed-off-by: Ivan Romanov <drizt72@zoho.eu>
Link: https://github.com/openwrt/openwrt/pull/23132
Signed-off-by: Robert Marko <robimarko@gmail.com>

package/network/services/dnsmasq/Makefile

@@ -44,7 +44,7 @@ define Package/dnsmasq/Default
   CATEGORY:=Base system
   TITLE:=DNS and DHCP server
   URL:=http://www.thekelleys.org.uk/dnsmasq/
-  DEPENDS:=+libubus
+  DEPENDS:=+libubus +@BUSYBOX_CONFIG_PIDOF
   USERID:=dnsmasq=453:dnsmasq=453
 endef