move all dependencies on qtls to a separate package

internal/qtls/structs_equal.go

@@ -0,0 +1,19 @@
+package qtls
+
+import "reflect"
+
+func structsEqual(a, b interface{}) bool {
+	sa := reflect.ValueOf(a).Elem()
+	sb := reflect.ValueOf(b).Elem()
+	if sa.NumField() != sb.NumField() {
+		return false
+	}
+	for i := 0; i < sa.NumField(); i++ {
+		fa := sa.Type().Field(i)
+		fb := sb.Type().Field(i)
+		if !reflect.DeepEqual(fa.Index, fb.Index) || fa.Name != fb.Name || fa.Anonymous != fb.Anonymous || fa.Offset != fb.Offset || !reflect.DeepEqual(fa.Type, fb.Type) {
+			return false
+		}
+	}
+	return true
+}