Break out non-Windows sys/mount usage into helper

Rather than bifurcate the test completely, this lets us keep the test
intact with a small function wrapper to allow the compiler to build the
code that'll never be called on Windows, on Windows.

Signed-off-by: Paul "TBBle" Hampson <Paul.Hampson@Pobox.com>

integration-cli/docker_api_containers_test.go

@@ -30,7 +30,6 @@ import (
 	"github.com/docker/docker/testutil/request"
 	"github.com/docker/docker/volume"
 	"github.com/docker/go-connections/nat"
-	"github.com/moby/sys/mount"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
 	"gotest.tools/v3/poll"
@@ -2056,7 +2055,7 @@ func (s *DockerSuite) TestContainersAPICreateMountsCreate(c *testing.T) {
 			assert.NilError(c, err)
 			defer os.RemoveAll(tmpDir3)
 
-			assert.Assert(c, mount.Mount(tmpDir3, tmpDir3, "none", "bind,shared") == nil)
+			assert.Assert(c, mountWrapper(tmpDir3, tmpDir3, "none", "bind,shared") == nil)
 
 			cases = append(cases, []testCase{
 				{

integration-cli/docker_api_containers_unix_test.go

@@ -0,0 +1,9 @@
+// +build !windows
+
+package main
+
+import "github.com/moby/sys/mount"
+
+func mountWrapper(device, target, mType, options string) error {
+	return mount.Mount(device, target, mType, options)
+}

integration-cli/docker_api_containers_windows_test.go

@@ -15,6 +15,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/mount"
+	"github.com/pkg/errors"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
 )
@@ -75,3 +76,8 @@ func (s *DockerSuite) TestContainersAPICreateMountsBindNamedPipe(c *testing.T) {
 	assert.NilError(c, err)
 	assert.Check(c, is.Equal(text, strings.TrimSpace(string(b))))
 }
+
+func mountWrapper(device, target, mType, options string) error {
+	// This should never be called.
+	return errors.Errorf("there is no implementation of Mount on this platform")
+}