[gtk+/wip/meson] gsk: Include the private header

[Emmanuele Bassi <ebassi src gnome org>]

commit f4d95fdb39de6ed8d2955e541ce5eb94682b02e2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Apr 18 15:14:35 2017 +0100

    gsk: Include the private header
    
    Both gskprivate.c and gskvulkanrenderer.c call `gsk_ensure_resources`
    but fail in clude `gskprivate.h`, where the function is declared.

 gsk/gskprivate.c      |    1 +
 gsk/gskvulkanrender.c |    2 ++
 2 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gsk/gskprivate.c b/gsk/gskprivate.c
index 9e82502..8404b9d 100644
--- a/gsk/gskprivate.c
+++ b/gsk/gskprivate.c
@@ -1,4 +1,5 @@
 #include "gskresources.h"
+#include "gskprivate.h"
 
 static gpointer
 register_resources (gpointer data)
diff --git a/gsk/gskvulkanrender.c b/gsk/gskvulkanrender.c
index 515a39c..cf98e18 100644
--- a/gsk/gskvulkanrender.c
+++ b/gsk/gskvulkanrender.c
@@ -1,5 +1,7 @@
 #include "config.h"
 
+#include "gskprivate.h"
+
 #include "gskvulkanrenderprivate.h"
 
 #include "gskrendererprivate.h"