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/healthcheck_unsupported.go

@@ -0,0 +1,25 @@
+//go:build !linux
+// +build !linux
+
+package libpod
+
+import (
+	"context"
+	"errors"
+)
+
+// createTimer systemd timers for healthchecks of a container
+func (c *Container) createTimer() error {
+	return errors.New("not implemented (*Container) createTimer")
+}
+
+// startTimer starts a systemd timer for the healthchecks
+func (c *Container) startTimer() error {
+	return errors.New("not implemented (*Container) startTimer")
+}
+
+// removeTransientFiles removes the systemd timer and unit files
+// for the container
+func (c *Container) removeTransientFiles(ctx context.Context) error {
+	return errors.New("not implemented (*Container) removeTransientFiles")
+}