Merge pull request #324861 from Kranzes/crate2nix

lib.systems: Fix setting rust.platform.os for wasm32-unknown-unknown

Changed files
+1
lib
systems
+1
lib/systems/default.nix
···
os =
/**/ if rust ? platform then rust.platform.os or "none"
else if final.isDarwin then "macos"
+
else if final.isWasm && !final.isWasi then "unknown" # Needed for {wasm32,wasm64}-unknown-unknown.
else final.parsed.kernel.name;
# https://doc.rust-lang.org/reference/conditional-compilation.html#target_family