Update to new 2.77test2 release.

Changelog: http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blob_plain;f=CHANGELOG;hb=68f6312d4bae30b78daafcd6f51dc441b8685b1e

Use readelf instead of objdump, unbreaking arm64 build. [1]
Submitted by: emaste@ [1]
Differential Revision: https://reviews.freebsd.org/D7881 [1]