[yocto] Getting the version of Yocto that is being used.

[Richard Collins]

I've inherited a Yocto project that I know to be an old version. So one of
my tasks is to update to the latest version. Before I do this I would like
to know what version I have. The only information I can find is the bitbake
version, BB_VERSION        = "1.32.0".

Many thanks,
Richard.
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