dnsmasq: [SECURITY] update to latest version 2.45

* 2.45 provides some kind of protection against the recently discovered
  DNS cache poisoning attacks.  The protection is not perfect.  It is
  somewhat unclear as to whether dnsmasq is really vulnerable.

diff --git a/packages/dnsmasq/dnsmasq_2.38.bb b/packages/dnsmasq/dnsmasq_2.45.bb
similarity index 100%
rename from packages/dnsmasq/dnsmasq_2.38.bb
rename to packages/dnsmasq/dnsmasq_2.45.bb