fsmonitor--daemon.h: remove unnecessary includes

The unnecessary include in the header transitively pulled in some
other headers actually needed by source files, though.  Have those
source files explicitly include the headers they need.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/fsmonitor--daemon.h b/fsmonitor--daemon.h
index 673f80d..5cbbec8 100644
--- a/fsmonitor--daemon.h
+++ b/fsmonitor--daemon.h
@@ -3,9 +3,7 @@
 
 #ifdef HAVE_FSMONITOR_DAEMON_BACKEND
 
-#include "dir.h"
-#include "run-command.h"
-#include "simple-ipc.h"
+#include "hashmap.h"
 #include "thread-utils.h"
 #include "fsmonitor-path-utils.h"