*: add go-1.17+ go:build tags

Go 1.17 introduce this new (and better) way to specify build tags.
For more info, see https://golang.org/design/draft-gobuild.

As a way to seamlessly switch from old to new build tags, gofmt (and
gopls) from go 1.17 adds the new tags along with the old ones.

Later, when go < 1.17 is no longer supported, the old build tags
can be removed.

Now, as I started to use latest gopls (v0.7.1), it adds these tags
while I edit. Rather than to randomly add new build tags, I guess
it is better to do it once for all files.

Mind that previous commits removed some tags that were useless,
so this one only touches packages that can at least be built
on non-linux.

Brought to you by

        go1.17 fmt ./...

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/apparmor/apparmor_unsupported.go

@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package apparmor

libcontainer/capabilities/capabilities.go

@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 package capabilities

libcontainer/capabilities/capabilities_unsupported.go

@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package capabilities

libcontainer/cgroups/getallpids_go115.go

@@ -1,3 +1,4 @@
+//go:build !go1.16
 // +build !go1.16
 
 package cgroups

libcontainer/configs/cgroup_unsupported.go

@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package configs

libcontainer/configs/configs_fuzzer.go

@@ -1,3 +1,4 @@
+//go:build gofuzz
 // +build gofuzz
 
 package configs

libcontainer/configs/namespaces_syscall.go

@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 package configs

libcontainer/configs/namespaces_syscall_unsupported.go

@@ -1,3 +1,4 @@
+//go:build !linux && !windows
 // +build !linux,!windows
 
 package configs

libcontainer/configs/namespaces_unsupported.go

@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package configs

libcontainer/devices/device_unix.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package devices

libcontainer/devices/device_unix_test.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package devices

libcontainer/integration/seccomp_test.go

@@ -1,3 +1,4 @@
+//go:build linux && cgo && seccomp
 // +build linux,cgo,seccomp
 
 package integration

libcontainer/nsenter/nsenter.go

@@ -1,3 +1,4 @@
+//go:build linux && !gccgo
 // +build linux,!gccgo
 
 package nsenter

libcontainer/nsenter/nsenter_gccgo.go

@@ -1,3 +1,4 @@
+//go:build linux && gccgo
 // +build linux,gccgo
 
 package nsenter

libcontainer/nsenter/nsenter_unsupported.go

@@ -1,3 +1,4 @@
+//go:build !linux || !cgo
 // +build !linux !cgo
 
 package nsenter

libcontainer/seccomp/patchbpf/enosys_linux.go

@@ -1,3 +1,4 @@
+//go:build cgo && seccomp
 // +build cgo,seccomp
 
 package patchbpf

libcontainer/seccomp/patchbpf/enosys_linux_test.go

@@ -1,3 +1,4 @@
+//go:build cgo && seccomp
 // +build cgo,seccomp
 
 package patchbpf

libcontainer/seccomp/patchbpf/enosys_unsupported.go

@@ -1,3 +1,4 @@
+//go:build !linux || !cgo || !seccomp
 // +build !linux !cgo !seccomp
 
 package patchbpf

libcontainer/seccomp/seccomp_linux.go

@@ -1,3 +1,4 @@
+//go:build cgo && seccomp
 // +build cgo,seccomp
 
 package seccomp

libcontainer/seccomp/seccomp_unsupported.go

@@ -1,3 +1,4 @@
+//go:build !linux || !cgo || !seccomp
 // +build !linux !cgo !seccomp
 
 package seccomp

libcontainer/system/linux.go

@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 package system

libcontainer/system/syscall_linux_32.go

@@ -1,3 +1,4 @@
+//go:build linux && (386 || arm)
 // +build linux
 // +build 386 arm
 

libcontainer/system/syscall_linux_64.go

@@ -1,3 +1,4 @@
+//go:build linux && (arm64 || amd64 || mips || mipsle || mips64 || mips64le || ppc || ppc64 || ppc64le || riscv64 || s390x)
 // +build linux
 // +build arm64 amd64 mips mipsle mips64 mips64le ppc ppc64 ppc64le riscv64 s390x
 

libcontainer/user/lookup_unix.go

@@ -1,3 +1,4 @@
+//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
 // +build darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package user

libcontainer/user/user_fuzzer.go

@@ -1,3 +1,4 @@
+//go:build gofuzz
 // +build gofuzz
 
 package user

libcontainer/userns/userns_fuzzer.go

@@ -1,3 +1,4 @@
+//go:build gofuzz
 // +build gofuzz
 
 package userns

libcontainer/userns/userns_unsupported.go

@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package userns

libcontainer/utils/utils_unix.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package utils