msg_parser.awk: removed gawkism from header name hash calculation
msg_parser.awk: removed gawkism from header name hash calculation

darcs-hash:20070307103222-88462-8760a9aa67804a7a35667b694641bb47e857199d.gz

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