Added an empty implementation of the shift_color() function - BeIDE needs

this one, maybe we should find out what it does, make it public and
document it.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16801 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/InterfaceDefs.cpp

@@ -765,6 +765,16 @@ tint_color(rgb_color color, float tint)
 }
 
 
+rgb_color shift_color(rgb_color color, float shift);
+
+rgb_color
+shift_color(rgb_color color, float shift)
+{
+	// TODO: dunno what this is supposed to do, but BeIDE expects it to be there...
+	return color;
+}
+
+
 static status_t
 load_menu_settings(menu_info &into)
 {