su_tagarg.h: call va_copy() before calling tl_vlist()
su_tagarg.h: call va_copy() before calling tl_vlist()

Looks like Solaris on amd64 is not happy with normal va_start()/va_end() use
of va_lists.

Thanks for Michael Jerris for reporting the problem.

darcs-hash:20071120113208-88462-825d34b76fc28bdb171d994641eb27f8c85defd5.gz

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