internal/rosa: pass stage alongside state

This cleans up many function signatures.

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

internal/rosa/util-linux.go

@@ -6,12 +6,12 @@ import (
 	"hakurei.app/internal/pkg"
 )
 
-func (t Toolchain) newUtilLinux(s *S) (pkg.Artifact, string) {
+func (t Toolchain) newUtilLinux() (pkg.Artifact, string) {
 	const (
 		version  = "2.42"
 		checksum = "Uy8Nxg9DsW5YwDoeaZeZTyQJ2YmnaaL_fSsQXsLUiFFUd7wnZeD_3SEaVO7ClJlk"
 	)
-	return s.NewPackage(t, "util-linux", version, newTar(
+	return t.NewPackage("util-linux", version, newTar(
 		"https://www.kernel.org/pub/linux/utils/util-linux/"+
 			"v"+strings.Join(strings.SplitN(version, ".", 3)[:2], ".")+
 			"/util-linux-"+version+".tar.gz",