internal/rosa: create metadata alongside artifact

This enables deferring evaluation of azalea-based packages and fixes the longstanding quirk of version being disjoint from other metadata.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/musl-fts.go

@@ -24,9 +24,7 @@ func (t Toolchain) newMuslFts() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	native.MustRegister(&Artifact{
-		f: Toolchain.newMuslFts,
-
+	native.mustRegister(Toolchain.newMuslFts, &Metadata{
 		Name:        "musl-fts",
 		Description: "implementation of fts(3) functions which are missing in musl libc",
 		Website:     "https://github.com/void-linux/musl-fts",