css: Move the last parser api to the new header

This lets us use it from the render node parser
in gsk.

gtk/css/gtkcssparserprivate.h

@@ -151,6 +151,9 @@ gsize                   gtk_css_parser_consume_any              (GtkCssParser
                                                                  gsize                           n_options,
                                                                  gpointer                        user_data);
 
+
+void            _gtk_css_print_string             (GString               *str,
+                                                   const char            *string);
 G_END_DECLS
 
 #endif /* __GTK_CSS_PARSER_H__ */

gtk/gtkcssparserprivate.h

@@ -24,13 +24,4 @@
 #include "gtk/css/gtkcsstokenizerprivate.h"
 #include "gtk/css/gtkcssparserprivate.h"
 
-G_BEGIN_DECLS
-
-/* XXX: Find better place to put it? */
-void            _gtk_css_print_string             (GString               *str,
-                                                   const char            *string);
-
-
-G_END_DECLS
-
 #endif /* __GTK_CSS_PARSER_PRIVATE_H__ */