For floppies call disk_close() only when the floppy MOTOR_TIMEOUT expired.
Otherwise call fsync(). This improves floppy performance, particularly when
using kernel 2.6.


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@820 7758b857-130e-0410-ab9c-d8735a528d18