simple-ipc: move definition of ipc_active_state outside of ifdef

Move the declartion of the `enum ipc_active_state` type outside of
the SUPPORTS_SIMPLE_IPC ifdef.

A later commit will introduce the `fsmonitor_ipc__*()` API and stub in
a "mock" implementation that requires this enum in some function
signatures.

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

simple-ipc.h

@@ -5,13 +5,6 @@
  * See Documentation/technical/api-simple-ipc.txt
  */
 
-#ifdef SUPPORTS_SIMPLE_IPC
-#include "pkt-line.h"
-
-/*
- * Simple IPC Client Side API.
- */
-
 enum ipc_active_state {
 	/*
 	 * The pipe/socket exists and the daemon is waiting for connections.
@@ -43,6 +36,13 @@ enum ipc_active_state {
 	IPC_STATE__OTHER_ERROR,
 };
 
+#ifdef SUPPORTS_SIMPLE_IPC
+#include "pkt-line.h"
+
+/*
+ * Simple IPC Client Side API.
+ */
+
 struct ipc_client_connect_options {
 	/*
 	 * Spin under timeout if the server is running but can't