For #307, support use sendto or sendmsg when senmmsg(1 msg)
For #307, support use sendto or sendmsg when senmmsg(1 msg)

winlinvip/srs,winlinvip/srs,ossrs/srs,ossrs/srs,winlinvip/srs,winlinvip/srs,ossrs/srs,winlinvip/simple-rtmp-server,winlinvip/srs,ossrs/srs,ossrs/srs,winlinvip/srs,ossrs/srs