check: make check-headers happy

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

src/cairo-composite-rectangles-private.h

@@ -38,6 +38,7 @@
 #define CAIRO_COMPOSITE_RECTANGLES_PRIVATE_H
 
 #include "cairo-types-private.h"
+#include "cairo-error-private.h"
 
 CAIRO_BEGIN_DECLS
 

src/cairo-pattern-private.h

@@ -36,6 +36,7 @@
 #ifndef CAIRO_PATTERN_PRIVATE_H
 #define CAIRO_PATTERN_PRIVATE_H
 
+#include "cairo-error-private.h"
 #include "cairo-types-private.h"
 #include "cairo-list-private.h"
 

src/cairo-pdf-operators-private.h

@@ -43,6 +43,7 @@
 #define CAIRO_PDF_OPERATORS_H
 
 #include "cairo-compiler-private.h"
+#include "cairo-error-private.h"
 #include "cairo-types-private.h"
 
 /* The glyph buffer size is based on the expected maximum glyphs in a

src/cairo-rtree-private.h

@@ -38,6 +38,7 @@
 #define CAIRO_RTREE_PRIVATE_H
 
 #include "cairo-compiler-private.h"
+#include "cairo-error-private.h"
 #include "cairo-types-private.h"
 
 #include "cairo-freelist-private.h"

src/cairo-surface-observer-private.h

@@ -36,6 +36,8 @@
 #ifndef CAIRO_SURFACE_SNAPSHOT_PRIVATE_H
 #define CAIRO_SURFACE_SNAPSHOT_PRIVATE_H
 
+#include "cairoint.h" /* cairo_surface_backend_t */
+
 #include "cairo-device-private.h"
 #include "cairo-surface-private.h"
 

src/cairo-surface-snapshot-private.h

@@ -36,6 +36,8 @@
 #ifndef CAIRO_SURFACE_SNAPSHOT_PRIVATE_H
 #define CAIRO_SURFACE_SNAPSHOT_PRIVATE_H
 
+#include "cairoint.h" /* for cairo_surface_backend_t */
+
 #include "cairo-surface-private.h"
 
 struct _cairo_surface_snapshot {

src/cairo-surface-subsurface-private.h

@@ -36,6 +36,8 @@
 #ifndef CAIRO_SURFACE_SUBSURFACE_PRIVATE_H
 #define CAIRO_SURFACE_SUBSURFACE_PRIVATE_H
 
+#include "cairoint.h" /* for cairo_surface_backend_t */
+
 #include "cairo-surface-private.h"
 
 struct _cairo_surface_subsurface {