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/libbsd.go

@@ -21,9 +21,7 @@ install -D /usr/src/libmd/src/helper.c src/helper.c
 	), version
 }
 func init() {
-	native.MustRegister(&Artifact{
-		f: Toolchain.newLibmd,
-
+	native.mustRegister(Toolchain.newLibmd, &Metadata{
 		Name:        "libmd",
 		Description: "Message Digest functions from BSD systems",
 		Website:     "https://www.hadrons.org/software/libmd/",
@@ -50,9 +48,7 @@ func (t Toolchain) newLibbsd() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	native.MustRegister(&Artifact{
-		f: Toolchain.newLibbsd,
-
+	native.mustRegister(Toolchain.newLibbsd, &Metadata{
 		Name:        "libbsd",
 		Description: "provides useful functions commonly found on BSD systems",
 		Website:     "https://libbsd.freedesktop.org/",