Fix GB28181 build failed.
Fix GB28181 build failed.

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