fix compile error with MSVC
fix compile error with MSVC


gamenet/qxmpp,unisontech/qxmpp,projedi/qxmpp-ffmpeg,deepak899/qxmpp,cccco/qxmpp,LightZam/qxmpp,olesalscheider/qxmpp,LightZam/qxmpp,pol51/QXMPP-CMake,ycsoft/qxmpp,kollix/qxmpp,kollix/qxmpp,KangLin/qxmpp,gamenet/qxmpp_old,Ilyatk/qxmpp,unisontech/qxmpp,deepak899/qxmpp,olesalscheider/qxmpp,deepak899/qxmpp,kollix/qxmpp,cccco/qxmpp,gotomypc/qxmpp,trulabs/qxmpp-old,gamenet/qxmpp,ycsoft/qxmpp,gamenet/qxmpp_old,cccco/qxmpp,LightZam/qxmpp,Kaffeine/qxmpp,trulabs/qxmpp-old,Kaffeine/qxmpp,unisontech/qxmpp,gamenet/qxmpp_old,trulabs/qxmpp-old,olesalscheider/qxmpp,gotomypc/qxmpp,pol51/QXMPP-CMake,ycsoft/qxmpp,pol51/QXMPP-CMake,Kaffeine/qxmpp,KangLin/qxmpp,projedi/qxmpp-ffmpeg,gamenet/qxmpp,Ilyatk/qxmpp,KangLin/qxmpp,gotomypc/qxmpp,Ilyatk/qxmpp