What you need to implement for Fuse's timing routines
=====================================================

If you're using SDL as the user interface, Fuse will use SDL's timing routines
and no further implementation is required.

If you're not using SDL, two routines are required:

* double compat_timer_get_time( void )

Return the number of seconds since an arbitrary epoch, or a value < 0 if
the time could not be determined.

* void compat_timer_sleep( int ms )

Cause Fuse to go to sleep for the given number of milliseconds.

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