libpod: Add stubs for non-linux builds

Note: this makes info.go linux-only since it mixes linux-specific and
generic code. This should be addressed in a separate refactoring PR.

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

libpod/container_stat_unsupported.go

@@ -0,0 +1,14 @@
+//go:build !linux
+// +build !linux
+
+package libpod
+
+import (
+	"errors"
+
+	"github.com/containers/podman/v4/libpod/define"
+)
+
+func (c *Container) stat(containerMountPoint string, containerPath string) (*define.FileInfo, string, string, error) {
+	return nil, "", "", errors.New("Containers stat not supported on this platform")
+}