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/zlib.go

@@ -2,14 +2,13 @@ package rosa
 
 import "hakurei.app/internal/pkg"
 
-// NewZlib returns a new [pkg.Artifact] containing an installation of zlib.
-func (t Toolchain) NewZlib() pkg.Artifact {
+func (t Toolchain) newZlib() pkg.Artifact {
 	const (
 		version  = "1.3.1"
 		checksum = "E-eIpNzE8oJ5DsqH4UuA_0GDKuQF5csqI8ooDx2w7Vx-woJ2mb-YtSbEyIMN44mH"
 	)
 	return t.New("zlib-"+version, []pkg.Artifact{
-		t.NewMake(),
+		t.Load(Make),
 	}, nil, nil, `
 cd "$(mktemp -d)"
 CC="clang -fPIC" /usr/src/zlib/configure \
@@ -23,3 +22,4 @@ make DESTDIR=/work install
 			pkg.TarGzip,
 		)))
 }
+func init() { artifactsF[Zlib] = Toolchain.newZlib }