Review request: liblerc

[Sandro Mani]

Hi

I've packaged liblerc which I'd like to use for the upcoming gdal-3.5.0. 
Review request is here [1]. It's a simple cmake/c++ library, and I've 
also added the mingw subpackages.

Happy to review in exchange.

Thanks

Sandro

[1] https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=2082662