[libgda] gda-server-provider: fix warnings

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 237f8e014613bbd8b45878c49f32207f36e9f8ce
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue Sep 11 08:54:57 2018 -0500

    gda-server-provider: fix warnings

 libgda/gda-server-provider.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/libgda/gda-server-provider.c b/libgda/gda-server-provider.c
index 4474f16cc..a680ef93d 100644
--- a/libgda/gda-server-provider.c
+++ b/libgda/gda-server-provider.c
@@ -49,6 +49,10 @@
 #include <libgda/gda-connection-private.h>
 #include <libgda/gda-connection-internal.h>
 #include <libgda/gda-debug-macros.h>
+#include <libgda/handlers/gda-handler-boolean.h>
+#include <libgda/handlers/gda-handler-string.h>
+#include <libgda/handlers/gda-handler-type.h>
+#include <libgda/handlers/gda-handler-numerical.h>
 #include "providers-support/gda-data-select-priv.h"
 
 /*