internal/rosa: key metadata by string

For upcoming azalea integration. The API is quite ugly right now to ease migration.

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

internal/rosa/libpng.go

@@ -6,12 +6,12 @@ import (
 	"hakurei.app/internal/pkg"
 )
 
-func (t Toolchain) newLibpng() (pkg.Artifact, string) {
+func (t Toolchain) newLibpng(s *S) (pkg.Artifact, string) {
 	const (
 		version  = "1.6.58"
 		checksum = "m_a5lROJH7vmF3cMjqwTUqURuQLhV1JQx2ySPzcN3VPdgDB9pG3UINsIx_mtkr-t"
 	)
-	return t.NewPackage("libpng", version, newTar(
+	return s.NewPackage(t, "libpng", version, newTar(
 		"https://downloads.sourceforge.net/project/libpng/libpng"+
 			strings.Join(strings.SplitN(version, ".", 3)[:2], "")+
 			"/"+version+"/libpng-"+version+".tar.gz",
@@ -22,7 +22,7 @@ func (t Toolchain) newLibpng() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Libpng] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibpng,
 
 		Name:        "libpng",
@@ -34,5 +34,5 @@ func init() {
 		},
 
 		ID: 1705,
-	}
+	})
 }