The original iperf package is unmaintained. This switches to the "iperf2"
project on sourceforge, a fork that started where the previous iperf left
off.
Version 2.0.8 fixes the issue that patch 002 handled, so that can be dropped.
Due to a faulty check in configure.ac, this version needs _GNU_SOURCE
defined to build properly against musl. Various other obsolete build
options were also removed.
Signed-off-by: Bert Vermeulen <bert@biot.com>