mtime: remove stray #include, fix warning on Windows
mtime: remove stray #include, fix warning on Windows

We do not call clock_gettime() in this file anymore.

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