Re #1771: Implement run-time configuration to set specific socket option.



git-svn-id: http://svn.pjsip.org/repos/pjproject@4860 74dad513-b988-da41-8d7b-12977e46ad98
Close #1772: Fixed error handling in pjsua_create() and pjsua_init().



git-svn-id: http://svn.pjsip.org/repos/pjproject@4861 74dad513-b988-da41-8d7b-12977e46ad98
Fix #1773: Added group lock to SIP transport to avoid race condition between transport callback and destroy.



git-svn-id: http://svn.pjsip.org/repos/pjproject@4862 74dad513-b988-da41-8d7b-12977e46ad98