internal/rosa: lazy initialise all artifacts

This improves performance, though not as drastically as lazy initialising llvm.

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

internal/rosa/llvm.go

@@ -188,7 +188,7 @@ cp -r /system/include /usr/include && rm -rf /system/include
 	if len(patches) > 1 {
 		source = t.New(
 			"llvmorg-patched", stage3Concat(t, []pkg.Artifact{},
-				t.NewPatch(),
+				t.Load(Patch),
 			), nil, nil, `
 cp -r /usr/src/llvmorg/. /work/.
 chmod -R +w /work && cd /work
@@ -201,14 +201,14 @@ cat /usr/src/llvm-patches/* | patch -p 1
 		Cache:  slices.Concat(cache, attr.cmake),
 		Append: cmakeAppend,
 		Extra: stage3Concat(t, attr.extra,
-			t.NewLibffi(),
-			t.NewPython(),
-			t.NewPerl(),
-			t.NewDiffutils(),
-			t.NewBash(),
-			t.NewCoreutils(),
+			t.Load(Libffi),
+			t.Load(Python),
+			t.Load(Perl),
+			t.Load(Diffutils),
+			t.Load(Bash),
+			t.Load(Coreutils),
 
-			t.NewKernelHeaders(),
+			t.Load(KernelHeaders),
 		),
 		Prefix: attr.prefix,
 
@@ -327,7 +327,7 @@ ln -s \
 			musl,
 			compilerRT,
 			runtimes,
-			t.NewGit(),
+			t.Load(Git),
 		},
 		script: `
 ln -s clang /work/system/bin/cc