threads: Fixed windows build.
threads: Fixed windows build.

MSVC isn't C99.

taikoo/libssh,DouglasHeriot/libssh,sebadoom/libssh,wangshawn/libssh,bigcat26/libssh-mod,kedazo/libssh,jt1/honeypot-libssh,mwgoldsmith/libssh,miloj/libssh-v0.5,sebadoom/libssh,kedazo/libssh,jt1/honeypot-libssh,jt1/honeypot-libssh,nviennot/libssh,mwgoldsmith/ssh,taikoo/libssh,mwgoldsmith/ssh,rofl0r/libssh,Distrotech/libssh,kedazo/libssh,mwgoldsmith/ssh,elastichosts/libssh,substack/libssh,bigcat26/libssh-mod,DouglasHeriot/libssh,bigcat26/libssh-mod,miloj/libssh-v0.5,robxu9/libssh,robxu9/libssh,rofl0r/libssh,sebadoom/libssh,taikoo/libssh,miloj/libssh-v0.5,wangshawn/libssh,DouglasHeriot/libssh,sebadoom/libssh,robxu9/libssh,jt1/honeypot-libssh,pouete/libssh,nviennot/libssh,Distrotech/libssh,Distrotech/libssh,DouglasHeriot/libssh,pouete/libssh,mwgoldsmith/libssh,taikoo/libssh,substack/libssh,elastichosts/libssh,rofl0r/libssh,nviennot/libssh,Distrotech/libssh,bigcat26/libssh-mod,mwgoldsmith/ssh,mwgoldsmith/libssh,jahrome/libssh,substack/libssh,elastichosts/libssh,jahrome/libssh,pouete/libssh,miloj/libssh-v0.5,mwgoldsmith/libssh,kedazo/libssh,jahrome/libssh,wangshawn/libssh,rofl0r/libssh,pouete/libssh,wangshawn/libssh,robxu9/libssh,jahrome/libssh,nviennot/libssh,substack/libssh