devel/hs-generic-lens-core: import hs-generic-lens-core-2.2.1.0

This library uses GHC.Generics to derive efficient optics (traversals,
lenses and prisms) for algebraic data types in a type-directed way, with a
focus on good type inference and error messages when possible.

This package is the shared internal logic of the generic-lens and
generic-optics libraries.

(pho)