builtin: a temporary []byte.str2() (until runes are implemented)

vlib/builtin/int.v

@@ -411,6 +411,18 @@ pub fn (b []byte) clone() []byte {
 	return res
 }
 
+pub fn (b []byte) str2() string {
+	return bytes2string(b)
+}
+
+// TODO copy pasted from builder.v
+fn bytes2string(b []byte) string {
+	mut copy := b.clone()
+	copy << `\0`
+	res := tos(copy.data, copy.len-1)
+	return res
+}
+
 
 // TODO generic
 pub fn (a []byte) contains(val byte) bool {