This is used by an application to check if it needs to call
libx52_update. If libx52_set_clock returns 0, it can be assumed that the
clock did change values that require an update, but any other value
indicates that an update is not required.
This is still a relative work-in-progress, since some of the functions
are being cleaned and enhanced to provide proper functionality similar
to the Windows driver.
The current contents of the libx52 folder contain all the source code
necessary to implement the X52 Pro vendor API. These have been tested,
although the committed test file does not list all the APIs.