Add //go:build lines

Starting with Go 1.17, //go:build lines are preferred over // +build
lines, see https://golang.org/doc/go1.17#build-lines and
https://golang.org/design/draft-gobuild for details.

This change was generated by running Go 1.17 `go fmt ./...` which
automatically adds //go:build lines based on the existing // +build
lines.

Author: tklauser

runewidth_appengine.go

@@ -1,3 +1,4 @@
+//go:build appengine
 // +build appengine
 
 package runewidth

runewidth_js.go

@@ -1,5 +1,5 @@
-// +build js
-// +build !appengine
+//go:build js && !appengine
+// +build js,!appengine
 
 package runewidth
 

runewidth_posix.go

@@ -1,6 +1,5 @@
-// +build !windows
-// +build !js
-// +build !appengine
+//go:build !windows && !js && !appengine
+// +build !windows,!js,!appengine
 
 package runewidth
 

runewidth_posix_test.go

@@ -1,6 +1,5 @@
-// +build !windows
-// +build !js
-// +build !appengine
+//go:build !windows && !js && !appengine
+// +build !windows,!js,!appengine
 
 package runewidth
 

runewidth_windows.go

@@ -1,5 +1,5 @@
-// +build windows
-// +build !appengine
+//go:build windows && !appengine
+// +build windows,!appengine
 
 package runewidth