Fix utest build failed for ::atoi
Fix utest build failed for ::atoi

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