[devhelp] Use only "really public" libdevhelp APIs in the app

[Sébastien Wilmet <swilmet src gnome org>]

commit de1624d85703dd1ae90b92ffc6c42f7f8919894f
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Apr 2 08:47:46 2018 +0200

    Use only "really public" libdevhelp APIs in the app
    
    DhSettings is now public. This was the last missing piece to #include
    only <devhelp/devhelp.h> in the app to access the libdevhelp API.

 src/dh-preferences.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/dh-preferences.c b/src/dh-preferences.c
index 2d1b59f..1267ff0 100644
--- a/src/dh-preferences.c
+++ b/src/dh-preferences.c
@@ -23,7 +23,6 @@
 #include "dh-preferences.h"
 #include <string.h>
 #include <devhelp/devhelp.h>
-#include "devhelp/dh-settings.h"
 #include "dh-settings-app.h"
 #include "dh-util-app.h"