all: Update build constraints to Go 1.17 style (#7894)

cmd/strelaypoolsrv/auto/noassets.go

@@ -4,7 +4,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//+build noassets
+//go:build noassets
+// +build noassets
 
 package auto
 

cmd/syncthing/openurl_unix.go

@@ -4,6 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
+//go:build !windows
 // +build !windows
 
 package main

cmd/syncthing/openurl_windows.go

@@ -4,6 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
+//go:build windows
 // +build windows
 
 package main

cmd/syncthing/options_others.go

@@ -4,6 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
+//go:build !windows
 // +build !windows
 
 package main

cmd/syncthing/perfstats_unix.go

@@ -4,6 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
+//go:build !solaris && !windows
 // +build !solaris,!windows
 
 package main

cmd/syncthing/perfstats_unsupported.go

@@ -4,6 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
+//go:build solaris || windows
 // +build solaris windows
 
 package main

cmd/syncthing/traceback.go

@@ -4,7 +4,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//+build go1.7
+//go:build go1.7
+// +build go1.7
 
 package main