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/flex.go

@@ -9,13 +9,13 @@ func (t Toolchain) newFlex() pkg.Artifact {
 		version  = "2.6.4"
 		checksum = "p9POjQU7VhgOf3x5iFro8fjhy0NOanvA7CTeuWS_veSNgCixIJshTrWVkc5XLZkB"
 	)
-	return t.NewViaMake("flex", version, pkg.NewHTTPGetTar(
+	return t.NewPackage("flex", version, pkg.NewHTTPGetTar(
 		nil, "https://github.com/westes/flex/releases/download/"+
 			"v"+version+"/flex-"+version+".tar.gz",
 		mustDecode(checksum),
 		pkg.TarGzip,
-	), nil,
-		t.Load(M4),
+	), nil, (*MakeHelper)(nil),
+		M4,
 	)
 }
 func init() { artifactsF[Flex] = Toolchain.newFlex }