asterisk-16.x: add patch for AST-2021-001

asterisk-16.x: add patch for AST-2021-001

180-AST-2019-007-16.diff refreshed.

Upstream patch for AST-2021-001 added. This patch is mainly for
res_pjsip_diversion, but the part that is patched there was added later
("res_pjsip_diversion: implement support for History-Info"), so asterisk
16.3.0 is not affected. Hence the res_pjsip_diversion part was removed
from the patch. The patch resolves similar overflow situations in
res_pjsip_path and res_pjsip_outbound_registration, so these were kept.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>