Log Message:
Update to latest stable, 4.0.0. Buildlink pthread. Move disabling of
trace and debug configure arguments to options.mk under the debug
PKG_OPTION.

From ChangeLog:

libosip2 (4.0.0)
        * implement time compensation for android.
        * reduce path len // remove path in front of logs.
        * accept only SIP/D.D format message.
        * fix bug when releasing request with missing major headers.
        * fix minor memory leak // remove limitation on fifo size.
        * add system time support for macosx and ios.
        * use system independant time for osip_gettimeofday on unix platform.
        * To compile/use osip based application in multi threaded
          env, you don't need to define -DOSIP_MT any more. Instead,
          if you wish to disable the feature, you can compile with
          -DOSIP_MONOTHREAD.
        * A few other clean up were made inside osip to avoid any
          define to appear in include files. Also to avoid conflict,
          config.h has been renamed to osip-config.h.