ioutil: Remove deprecated functions where possible

runtime/syntax/make_headers.go

@@ -6,7 +6,6 @@ package main
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 	"time"
@@ -34,7 +33,7 @@ func main() {
 	if len(os.Args) > 1 {
 		os.Chdir(os.Args[1])
 	}
-	files, _ := ioutil.ReadDir(".")
+	files, _ := os.ReadDir(".")
 	for _, f := range files {
 		fname := f.Name()
 		if strings.HasSuffix(fname, ".yaml") {
@@ -46,7 +45,7 @@ func main() {
 func convert(name string) {
 	filename := name + ".yaml"
 	var hdr HeaderYaml
-	source, err := ioutil.ReadFile(filename)
+	source, err := os.ReadFile(filename)
 	if err != nil {
 		panic(err)
 	}
@@ -68,7 +67,7 @@ func encode(name string, c HeaderYaml) {
 
 func decode(name string) Header {
 	start := time.Now()
-	data, _ := ioutil.ReadFile(name + ".hdr")
+	data, _ := os.ReadFile(name + ".hdr")
 	strs := bytes.Split(data, []byte{'\n'})
 	var hdr Header
 	hdr.FileType = string(strs[0])

runtime/syntax/syntax_converter.go

@@ -4,7 +4,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"regexp"
 	"strings"
@@ -161,6 +160,6 @@ func main() {
 		return
 	}
 
-	data, _ := ioutil.ReadFile(os.Args[1])
+	data, _ := os.ReadFile(os.Args[1])
 	fmt.Print(generateFile(parseFile(string(data), os.Args[1])))
 }