internal/rosa/musl: migrate to make helper

This is much cleaner and eliminates the early ugliness.

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

internal/rosa/llvm.go

@@ -246,11 +246,8 @@ func (t Toolchain) newLLVM() (musl, compilerRT, runtimes, clang pkg.Artifact) {
 			{"COMPILER_RT_BUILD_XRAY", "OFF"},
 		},
 		append: []string{"compiler-rt"},
-		extra: []pkg.Artifact{t.NewMusl(&MuslAttr{
-			Headers: true,
-			Env: []string{
-				"CC=clang",
-			},
+		extra: []pkg.Artifact{t.newMusl(true, []string{
+			"CC=clang",
 		})},
 		script: `
 mkdir -p "${ROSA_INSTALL_PREFIX}/lib/clang/21/lib/"
@@ -267,18 +264,15 @@ ln -s \
 `,
 	})
 
-	musl = t.NewMusl(&MuslAttr{
-		Extra: []pkg.Artifact{compilerRT},
-		Env: stage0ExclConcat(t, []string{
-			"CC=clang",
-			"LIBCC=/system/lib/clang/21/lib/" +
-				triplet() + "/libclang_rt.builtins.a",
-			"AR=ar",
-			"RANLIB=ranlib",
-		},
-			"LDFLAGS="+earlyLDFLAGS(false),
-		),
-	})
+	musl = t.newMusl(false, stage0ExclConcat(t, []string{
+		"CC=clang",
+		"LIBCC=/system/lib/clang/21/lib/" +
+			triplet() + "/libclang_rt.builtins.a",
+		"AR=ar",
+		"RANLIB=ranlib",
+	},
+		"LDFLAGS="+earlyLDFLAGS(false),
+	), compilerRT)
 
 	runtimes = t.newLLVMVariant("runtimes", &llvmAttr{
 		env: stage0ExclConcat(t, []string{},