[gtk+/composite-templates] Remove unintentional symbol export

[Juan Pablo Ugarte <jpu src gnome org>]

commit cc49bd0d8568f7403aac91da33bffc735d4b78c6
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Aug 29 18:16:34 2012 -0400

    Remove unintentional symbol export
    
    Just a forgotten static.

 gtk/gtkcssbgsizevalue.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkcssbgsizevalue.c b/gtk/gtkcssbgsizevalue.c
index 349a986..d7349dd 100644
--- a/gtk/gtkcssbgsizevalue.c
+++ b/gtk/gtkcssbgsizevalue.c
@@ -40,7 +40,7 @@ gtk_css_value_bg_size_free (GtkCssValue *value)
   g_slice_free (GtkCssValue, value);
 }
 
-GtkCssValue *
+static GtkCssValue *
 gtk_css_value_bg_size_compute (GtkCssValue        *value,
                                guint               property_id,
                                GtkStyleContext    *context,