test_nua.vcproj: added test_offer_answer.c
test_nua.vcproj: added test_offer_answer.c

darcs-hash:20070226203300-55b16-7edb4391ce7a0d2c49dd8b5186ce49fd3c8956c1.gz

unispeech/sofia-sip,xhook/sofia-sip,BelledonneCommunications/sofia-sip,unispeech/sofia-sip,BelledonneCommunications/sofia-sip,jart/sofia-sip,erdincay/sofia-sip,unispeech/sofia-sip,jart/sofia-sip,unispeech/sofia-sip,erdincay/sofia-sip,xhook/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip,BelledonneCommunications/sofia-sip,erdincay/sofia-sip,jart/sofia-sip,xhook/sofia-sip,xhook/sofia-sip,xhook/sofia-sip