[#2605] Update to PJSIP 1.5.5

...ibs/pjproject/pjlib/src/pj/log_writer_symbian_console.cpp

...ne-common/libs/pjproject/pjlib/src/pj/os_core_symbian.cpp

sflphone-common/libs/pjproject/pjlib/src/pj/os_core_win32.c

...e-common/libs/pjproject/pjlib/src/pj/os_error_symbian.cpp

sflphone-common/libs/pjproject/pjlib/src/pj/pool.c

...ne-common/libs/pjproject/pjlib/src/pj/pool_policy_new.cpp

sflphone-common/libs/pjproject/pjlib/src/pj/sock_bsd.c

sflphone-common/libs/pjproject/pjlib/src/pj/sock_common.c

sflphone-common/libs/pjproject/pjlib/src/pj/sock_qos_bsd.c

...hone-common/libs/pjproject/pjlib/src/pj/sock_qos_common.c

sflphone-common/libs/pjproject/pjlib/src/pj/sock_qos_dummy.c

...e-common/libs/pjproject/pjlib/src/pj/sock_qos_symbian.cpp

sflphone-common/libs/pjproject/pjlib/src/pj/sock_qos_wm.c

...ommon/libs/pjproject/pjlib/src/pj/sock_select_symbian.cpp

sflphone-common/libs/pjproject/pjlib/src/pj/sock_symbian.cpp

...hone-common/libs/pjproject/pjlib/src/pj/ssl_sock_common.c

sflphone-common/libs/pjproject/pjlib/src/pj/ssl_sock_ossl.c

...e-common/libs/pjproject/pjlib/src/pj/ssl_sock_symbian.cpp

...hone-common/libs/pjproject/pjlib/src/pj/timer_symbian.cpp

...ne-common/libs/pjproject/pjlib/src/pj/unicode_symbian.cpp