filter_kubernetes: Tweak FLB_KUBE_TAG_PREFIX for Windows
A typical setup on Windows pods includes something like this:
[INPUT]
Name Tail
Path c:\var\log\containers\*
Tag  kube.*
In this case, in_tail emits events with a tag prefixed with
"kube.c.var.log.containers". Let's make it the default value
on Windows build.
* Default expected Kubernetes tag prefix, this is used mostly when source
* data comes from in_tail with custom tags like: kube.service.*
*/
+#ifdef FLB_SYSTEM_WINDOWS
+#define FLB_KUBE_TAG_PREFIX "kube.c.var.log.containers."
+#else
#define FLB_KUBE_TAG_PREFIX "kube.var.log.containers."
+#endif
struct kube_meta;
