autogen.sh: use AUTORECONF enironment variable for versioned autoreconf
autogen.sh: use AUTORECONF enironment variable for versioned autoreconf

darcs-hash:20060817182326-65a35-33634d0b0ded940e70aa400728b5a2c13a06fcde.gz

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