http: remove bogus persistent connection support
http: remove bogus persistent connection support

This became dead code with b0247e59d5b2b3556f44295f6276a00d222f9277 and
ostensibly did not work properly before that.

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc