netlink: fix wrong use of netlink flags for dump operations

[catta] / avahi-sharp / avahi-sharp.dll.config.in

<configuration>
  <dllmap dll="avahi-client" target="@CLIENT_DLNAME@"/>
  <dllmap dll="avahi-common" target="@COMMON_DLNAME@"/>
  <dllmap dll="avahi-glib" target="@GLIB_DLNAME@"/>
</configuration>