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/kmod.go

@@ -32,9 +32,7 @@ func (t Toolchain) newKmod() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	native.MustRegister(&Artifact{
-		f: Toolchain.newKmod,
-
+	native.mustRegister(Toolchain.newKmod, &Metadata{
 		Name:        "kmod",
 		Description: "a set of tools to handle common tasks with Linux kernel modules",
 		Website:     "https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git",