add casts to C.UDTSOCKET to fix compiler errors on old versions of gcc (syncbox and buildbox)
add casts to C.UDTSOCKET to fix compiler errors on old versions of gcc (syncbox and buildbox)

Syncbak-Git/go-udtwrapper,Syncbak-Git/go-udtwrapper,Syncbak-Git/go-udtwrapper,Syncbak-Git/go-udtwrapper