net-snmp: remove spurious libelf dependency

Signed-off-by: Steven Barth <steven@midlink.org>

net/net-snmp/Makefile

@@ -40,7 +40,6 @@ define Package/libnetsnmp
 $(call Package/net-snmp/Default)
   SECTION:=libs
   CATEGORY:=Libraries
-  DEPENDS:=+libelf1
   TITLE:=Open source SNMP implementation (libraries)
 endef
 
@@ -80,7 +79,6 @@ endef
 define Package/snmpd-static
 $(call Package/net-snmp/Default)
   TITLE:=Open source SNMP implementation (daemon)
-  DEPENDS:=+libelf1
 endef
 
 define Package/snmpd-static/description