Version of the OS currently running.
The major and minor version of the Operating System currently running.
Set by allegro_init(). If Allegro for some reason was not able to
retrieve the version of the Operating System, os_version and
os_revision will be set to -1. For example: Under Win98 SE (v4.10.2222)
os_version will be set to 4 and os_revision to 10.
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