[gtk] gsk/gl: Include cairo.h consistently

[Chun-wei Fan <fanchunwei src gnome org>]

commit dfb06e1c7ad8671ecc5c758836ec9c0ddf947a24
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Mar 28 11:23:43 2018 +0800

    gsk/gl: Include cairo.h consistently
    
    Follow the other sources that include cairo.h, by just doing #include
    <cairo.h>, not <cairo/cairo.h>.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773299

 gsk/gl/gskglglyphcache.c   | 2 +-
 gsk/gl/gskglimageprivate.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gsk/gl/gskglglyphcache.c b/gsk/gl/gskglglyphcache.c
index e1d9ffd50b..842a899427 100644
--- a/gsk/gl/gskglglyphcache.c
+++ b/gsk/gl/gskglglyphcache.c
@@ -6,7 +6,7 @@
 #include "gskprivate.h"
 
 #include <graphene.h>
-#include <cairo/cairo.h>
+#include <cairo.h>
 #include <epoxy/gl.h>
 
 /* Parameters for our cache eviction strategy.
diff --git a/gsk/gl/gskglimageprivate.h b/gsk/gl/gskglimageprivate.h
index 5a58fea5c9..547f0cb171 100644
--- a/gsk/gl/gskglimageprivate.h
+++ b/gsk/gl/gskglimageprivate.h
@@ -2,7 +2,7 @@
 #define __GSK_GL_IMAGE_H__
 
 #include "gskgldriverprivate.h"
-#include <cairo/cairo.h>
+#include <cairo.h>
 
 typedef struct
 {