virtcontainers: Make all Linux VMMs only build on Linux

Some of them (e.g. QEMU) can run on other OSes (e.g. Darwin) but the
current virtcontainers implementation is Linux specific.

Signed-off-by: Samuel Ortiz <s.ortiz@apple.com>

src/runtime/virtcontainers/acrn.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2019 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/acrn_arch_base.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2019 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/acrn_test.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2019 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/clh.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2019 Ericsson Eurolab Deutschland GmbH
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/clh_test.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2019 Ericsson Eurolab Deutschland G.m.b.H.
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/fc.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/fc_metrics.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2020 Ant Group
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/fc_test.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2019 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2016 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_amd64.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_amd64_test.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_arch_base.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_arch_base_test.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_arm64.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_arm64_test.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 IBM
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_ppc64le.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 IBM
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_ppc64le_test.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 IBM
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_s390x.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 IBM
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_s390x_test.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2018 IBM
 //
 // SPDX-License-Identifier: Apache-2.0

src/runtime/virtcontainers/qemu_test.go

@@ -1,3 +1,6 @@
+//go:build linux
+// +build linux
+//
 // Copyright (c) 2016 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0