Revert "Tell dnsmasq not to start wildcard sockets"

This reverts commit f1dfabed.

The 3.4 kernel does not have SO_REUSEPORT functionality but the
headers #define it, so dnsmasq tries to use it and setsockopt
duly fails.

This is not a problem on 3.10 and later kernels, but reverting anyway.

Bug: 9580643
Bug: 26301652
Change-Id: I2322a80caa76ee4b7bb290f1665081b17d86fd43