[devhelp] BookManager: remove useless #includes

[Sébastien Wilmet <swilmet src gnome org>]

commit 4e01f6dbabc79b5caf1115433ebb00d1df5b7f67
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Dec 29 20:51:16 2017 +0100

    BookManager: remove useless #includes

 src/dh-book-manager.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/dh-book-manager.c b/src/dh-book-manager.c
index 9765cc5..d92b53b 100644
--- a/src/dh-book-manager.c
+++ b/src/dh-book-manager.c
@@ -24,7 +24,6 @@
 #include "config.h"
 #include "dh-book-manager.h"
 #include "dh-book.h"
-#include "dh-link.h"
 #include "dh-settings.h"
 #include "dh-util.h"