res_pjsip_log_forwarder.c: Add CLI "pjsip show buildopts".

PJPROJECT has a function available to dump the compile time
options used when building the library.

* Add CLI "pjsip show buildopts" command.

* Update contrib/scripts/autosupport to get pjproject information.

Change-Id: Id93a6a916d765b2a2e5a1aeb54caaf83206be748