Update to Asterisk 1.8.24.0: this is a general bugfix release:

The Asterisk Development Team has announced the release of Asterisk 1.8.24.0.

The release of Asterisk 1.8.24.0 resolves several issues reported by the
community and would have not been possible without your participation.
Thank you!

The following is a sample of the issues resolved in this release:

* --- Fix a longstanding issue with MFC-R2 configuration that
      prevented users

* --- Fix Not Storing Current Incoming Recv Address

* --- Fix Segfault When Syntax Of A Line Under [applicationmap] Is
      Invalid

* --- Tolerate presence of RFC2965 Cookie2 header by ignoring it

For a full list of changes in this release, please see the ChangeLog:

http://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-1.8.24.0

Thank you for your continued support of Asterisk!
Updated comms/asterisk18 to 1.8.24.0
Provide some sane ARFLAGS.
Remove an unused variable that breaks the clang build.
Remove obsolete --with-static-rnd=auto as suggested by Andreas Gustafsson
in PR 48345.
Remove obsolete --with-static-rnd=auto, as suggested by Andreas Gustafsson
in PR 48345.