internal/rosa: optionally load built-ins from filesystem

This avoids having to rebuild cmd/mbf over and over.

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

internal/rosa/rosa.go

@@ -2,14 +2,11 @@
 package rosa
 
 import (
-	"embed"
-	"io/fs"
 	"os"
 	"slices"
 	"strconv"
 	"strings"
 	"sync"
-	"time"
 	"unsafe"
 
 	"hakurei.app/fhs"
@@ -623,28 +620,3 @@ func (attr *GenericHelper) script(t Toolchain, _ string) string {
 	script += attr.Install
 	return script
 }
-
-// parseTime is the duration of early parsing of built-in azalea expressions.
-var parseTime time.Duration
-
-// ParseTime returns the time taken by early parsing of built-in azalea expressions.
-func ParseTime() time.Duration { return parseTime }
-
-// builtinAzalea is the backing directory of built-in azalea-based [Artifact]
-// implementations.
-//
-//go:embed package
-var builtinAzalea embed.FS
-
-func init() {
-	sub, err := fs.Sub(builtinAzalea, "package")
-	if err != nil {
-		panic(err)
-	}
-	t := time.Now()
-	if err = builtin.RegisterFS(sub); err != nil {
-		println(err.Error())
-		os.Exit(1)
-	}
-	parseTime = time.Since(t)
-}