修正 runtime 的 utf8 相关常量定义位置错误

waroot/src/runtime/runtime.wa

@@ -204,6 +204,22 @@ func next_rune(iter: stringIter) => (ok: bool, k: int, v: rune, pos: int) {
 	return
 }
 
+const (
+	MaxRune   = '\U0010FFFF'
+	RuneError = '\uFFFD'
+	surrogateMin = 0xD800
+	surrogateMax = 0xDFFF
+	tx = 0b10000000
+	t2 = 0b11000000
+	t3 = 0b11100000
+	t4 = 0b11110000
+	maskx = 0b00111111
+
+	rune1Max = 1<<7 - 1
+	rune2Max = 1<<11 - 1
+	rune3Max = 1<<16 - 1
+)
+
 func stringFromRune(r: rune) => string {
 	p := make([]byte, 0, 4)
 	n: i32

waroot/src/runtime/runtime_wasi.wa

@@ -114,22 +114,6 @@ func waPrintString(s: string) {
 	printString(s)
 }
 
-const (
-	MaxRune   = '\U0010FFFF'
-	RuneError = '\uFFFD'
-	surrogateMin = 0xD800
-	surrogateMax = 0xDFFF
-	tx = 0b10000000
-	t2 = 0b11000000
-	t3 = 0b11100000
-	t4 = 0b11110000
-	maskx = 0b00111111
-
-	rune1Max = 1<<7 - 1
-	rune2Max = 1<<11 - 1
-	rune3Max = 1<<16 - 1
-)
-
 #wa:linkname $runtime.waPrintRune
 func waPrintRune(r: i32) {
 	printString(stringFromRune(r))