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/strace.go

@@ -37,9 +37,7 @@ sed -i 's/unsigned int msg_len;$/uint32_t msg_len;/g' \
 	), version
 }
 func init() {
-	native.MustRegister(&Artifact{
-		f: Toolchain.newStrace,
-
+	native.mustRegister(Toolchain.newStrace, &Metadata{
 		Name:        "strace",
 		Description: "a diagnostic, debugging and instructional userspace utility",
 		Website:     "https://strace.io/",