libargon2-devel is missing libargon2.pc file

[Alexey Sokolov via Cygwin]

Hello, the packaged version of libargon2 is quite old. In 2019 upstream 
added the .pc file, and released new version. As of now it's harder than 
necessary to use libargon2 on cygwin - need to special case cygwin and 
include the header/library manually. Please update.

Thanks
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