Fix building on non linux platforms

Currently this code is not building correctly on darwin builds.
This PR handles non linux platforms correctly.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

common/pkg/seccomp/seccomp_unsupported.go

@@ -1,10 +1,10 @@
-// +build !seccomp
+// +build !linux !seccomp
 
 // SPDX-License-Identifier: Apache-2.0
 
 // Copyright 2013-2018 Docker, Inc.
 
-package seccomp 
+package seccomp
 
 import (
 	"errors"
@@ -38,3 +38,9 @@ func LoadProfileFromConfig(config *Seccomp, specgen *specs.Spec) (*specs.LinuxSe
 func IsEnabled() bool {
 	return false
 }
+
+// IsSupported returns true if the system has been configured to support
+// seccomp.
+func IsSupported() bool {
+	return false
+}

common/pkg/seccomp/supported.go

@@ -1,4 +1,4 @@
-// +build !windows
+// +build linux,seccomp
 
 package seccomp
 

common/pkg/seccomp/supported_test.go

@@ -1,3 +1,5 @@
+// +build seccomp
+
 package seccomp
 
 import (