Enable support for Scheme using dev-scheme/racket

Packages describing “racket” as local USE flag

Package “racket” Flag Description
app-editors/vim Enable support for Scheme using dev-scheme/racket
dev-lang/idris2 build using dev-scheme/racket
app-editors/gvim Enable support for Scheme using dev-scheme/racket

All packages providing a “racket” USE flag (3)