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When not using async, first try read with a timeout.  If it fails,
display a message suggesting a different CD access method.

Since the subchannel data is either computed from scratch or
read from a separate sbi file, it's entirely unnecessary.

This avoids a synchronous file read in PreSeekHack in the CD
controller code which otherwise completely defeats async read
behavior.  It also makes the sector read hint provided to the
background thread more useful.

Rather than blocking the main thread waiting for data, try again at a
later emulation update.

This reverts commit 8b83de24.

improvements