Merge "pjproject: Upgrade to 2.8."

configure

configure.ac

include/asterisk/autoconfig.h.in

res/res_pjsip/config_system.c

res/res_pjsip_sdp_rtp.c

third-party/pjproject/Makefile.rules

third-party/pjproject/configure.m4

third-party/pjproject/patches/0000-remove-third-party.patch

third-party/pjproject/patches/0000-solaris.patch

...ip_parser-Fix-return-code-in-pjsip_find_msg-and-add.patch

...s/0030-sip_transport-Destroy-transports-not-in-hash.patch

third-party/pjproject/patches/0040-183_without_to_tag.patch

...pjproject/patches/0050-dont_terminate_session_early.patch

...s/0060-sip_msg-Prevent-crash-on-header-without-vptr.patch

...s_core_unix-Set-mutex-NULL-in-atomic-destroy-and-ad.patch

...ip_transaction-In-tsx_timer_callback-check-if-tsx-i.patch

...ip_inv-Add-option-to-accept-updated-SDP-on-same-To-.patch

...ty/pjproject/patches/0110_fix_tdata_rexmit_deadlock.patch

third-party/pjproject/pjproject-2.7.2.tar.bz2.md5

third-party/pjproject/pjproject-2.8.tar.bz2.md5