cogl-winsys-egl-wayland: Include cogl-wayland-renderer.h

The Wayland winsys defines functions declared in
cogl-wayland-renderer.h so it should include the header to make sure
the declarations are right. This was breaking because currently the
header #defines the _EXP suffixes on to the function names so it would
end up exporting the wrong symbol names.

cogl/winsys/cogl-winsys-egl-wayland.c

@@ -37,6 +37,7 @@
 #include "cogl-winsys-egl-private.h"
 #include "cogl-renderer-private.h"
 #include "cogl-onscreen-private.h"
+#include "cogl-wayland-renderer.h"
 
 static const CoglWinsysEGLVtable _cogl_winsys_egl_vtable;