Reconfigure PJSIP when doing a clean recompile and vice versa

darcs-hash:20090514113216-58103-515f5de924f6a5654de995b50848276b52746fe8
Added -O3 to PJSIP CFLAGS

darcs-hash:20090514113303-58103-2c54cb7f8c5eff030b6e83351ae62ee13a3e1987