internal/rosa/make: migrate to helper interface

This also updates all affected artifacts to use new behaviour.

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

internal/rosa/libxslt.go

@@ -11,27 +11,22 @@ func (t Toolchain) newLibxslt() pkg.Artifact {
 		version  = "1.1.45"
 		checksum = "vw72UbREQnA3YDYuZ9-93hDr9BYCaKV6oh_U4Kt4n1Js_na4E-nFj-ksZnZ0kvEK"
 	)
-	return t.NewViaMake("libxslt", version, pkg.NewHTTPGet(
+	return t.NewPackage("libxslt", version, pkg.NewHTTPGet(
 		nil, "https://download.gnome.org/sources/libxslt/"+
 			strings.Join(strings.Split(version, ".")[:2], ".")+
 			"/libxslt-"+version+".tar.xz",
 		mustDecode(checksum),
-	), &MakeAttr{
-		ScriptEarly: `
-cd /usr/src/
-tar xf libxslt.tar.xz
-mv libxslt-` + version + ` libxslt
-`,
-		SourceSuffix: ".tar.xz",
-
+	), &PackageAttr{
+		SourceKind: sourceTarXZ,
+	}, &MakeHelper{
 		// python libxml2 cyclic dependency
 		SkipCheck: true,
 	},
-		t.Load(XZ),
-		t.Load(Python),
-		t.Load(PkgConfig),
+		XZ,
+		Python,
+		PkgConfig,
 
-		t.Load(Libxml2),
+		Libxml2,
 	)
 }
 func init() { artifactsF[Libxslt] = Toolchain.newLibxslt }