fix breakage found by mass one-applet builds

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

networking/udhcp/Config.src

@@ -16,7 +16,6 @@ config UDHCPD
 config DHCPRELAY
 	bool "dhcprelay"
 	default y
-	depends on UDHCPD
 	help
 	  dhcprelay listens for dhcp requests on one or more interfaces
 	  and forwards these requests to a different interface or dhcp
@@ -25,7 +24,6 @@ config DHCPRELAY
 config DUMPLEASES
 	bool "Lease display utility (dumpleases)"
 	default y
-	depends on UDHCPD
 	help
 	  dumpleases displays the leases written out by the udhcpd server.
 	  Lease times are stored in the file by time remaining in lease, or

networking/udhcp/Kbuild.src

@@ -15,7 +15,7 @@ lib-$(CONFIG_UDHCPD)     += common.o packet.o signalpipe.o socket.o
 lib-$(CONFIG_UDHCPC)     += dhcpc.o
 lib-$(CONFIG_UDHCPD)     += dhcpd.o arpping.o
 lib-$(CONFIG_DUMPLEASES) += dumpleases.o
-lib-$(CONFIG_DHCPRELAY)  += dhcprelay.o
+lib-$(CONFIG_DHCPRELAY)  += dhcprelay.o common.o socket.o packet.o
 
 lib-$(CONFIG_FEATURE_UDHCPC_ARPING) += arpping.o
 lib-$(CONFIG_FEATURE_UDHCP_RFC3397) += domain_codec.o