Removed obsolete +build directives in favor of modern go:build

serial_darwin_64.go

@@ -1,12 +1,11 @@
-// +build darwin
-// +build amd64 arm64
-
 //
 // Copyright 2014-2021 Cristian Maglie. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 //
 
+//go:build darwin && (amd64 || arm64)
+
 package serial
 
 import "golang.org/x/sys/unix"

serial_resetbuf_linux_bsd.go

@@ -4,7 +4,7 @@
 // license that can be found in the LICENSE file.
 //
 
-// +build linux freebsd openbsd
+//go:build linux || freebsd || openbsd
 
 package serial
 

serial_specialbaudrate_linux.go

@@ -1,12 +1,11 @@
-// +build linux
-// +build !ppc64le
-
 //
 // Copyright 2014-2021 Cristian Maglie. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 //
 
+//go:build linux && !ppc64le
+
 package serial
 
 import "golang.org/x/sys/unix"

serial_unix.go

@@ -5,7 +5,6 @@
 //
 
 //go:build linux || darwin || freebsd || openbsd
-// +build linux darwin freebsd openbsd
 
 package serial
 

unixutils/pipe.go

@@ -4,7 +4,7 @@
 // license that can be found in the LICENSE file.
 //
 
-// +build linux darwin freebsd openbsd
+//go:build linux || darwin || freebsd || openbsd
 
 package unixutils
 

unixutils/select.go

@@ -4,7 +4,7 @@
 // license that can be found in the LICENSE file.
 //
 
-// +build linux darwin freebsd openbsd
+//go:build linux || darwin || freebsd || openbsd
 
 package unixutils