Enable languages.c for Crystal
#682
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Crystal needs at least a linker available and `pkg-config`, but other parts of the C toolchain are also often useful. A more minimal implementation would be adding `pkgs.gcc` and `pkgs.pkg-config` as the bare minimum. The idea of enabling the entire C language is copied from the Rust configuration, so I figure it should be fine for Crystal as well.
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Crystal needs at least a linker available and
pkg-config, but other parts of the C toolchain are also often useful.A more minimal implementation would be adding
pkgs.gccandpkgs.pkg-configas the bare minimum. The idea of enabling the entire C language is copied from the Rust configuration, so I figure it should be fine for Crystal as well.