cmd/planterette: remove hsu special case

Remove special case and invoke hakurei out of process.

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

internal/path.go

@@ -8,16 +8,26 @@ import (
 )
 
 var (
-	hsu = compPoison
+	hakurei = compPoison
+	hsu     = compPoison
 )
 
+func MustHakureiPath() string {
+	if name, ok := checkPath(hakurei); ok {
+		return name
+	}
+	hlog.BeforeExit()
+	log.Fatal("invalid hakurei path, this program is compiled incorrectly")
+	return compPoison // unreachable
+}
+
 func MustHsuPath() string {
 	if name, ok := checkPath(hsu); ok {
 		return name
 	}
 	hlog.BeforeExit()
 	log.Fatal("invalid hsu path, this program is compiled incorrectly")
-	return compPoison
+	return compPoison // unreachable
 }
 
 func checkPath(p string) (string, bool) { return p, p != compPoison && p != "" && path.IsAbs(p) }