* feat: Add a mechanism to disable checks for SCTP (--without-sctp).
The use case for this is building a static iperf3 binary on CentOS 7,
on a system with SCTP installed (but it has no static SCTP libraries).
In that case we need to disable SCTP detection to prevent a linking
error at runtime.
While here, s/iperf /iperf3 / in a couple of help strings.
Note this option only has a long option flag; we're running out of
letters for short options.
Based heavily on a patch submitted in Issue 131 (SCTP support for
iperf); I added support for FreeBSD and did some other packaging and
documentation improvements.
We probably shouldn't tie SCTP support to looking specifically for
Linux or FreeBSD; we probably leave support enabled all the time if
possible, possibly with some configure-time checks.
Also bumped package id from 3.0a4 to 3.0a5.
This changeset consists of a one-line edit to configure.ac, plus
about fifty kilolines of diffs to a bunch of other config files
generated by bootstrap.sh.
