Add shell_global_set_stage_input_area() to header file

shell_global_set_stage_input_area() wasn't in the header file
so it wasn't introspected; add it.

svn path=/trunk/; revision=9

src/shell-global.h

@@ -21,6 +21,13 @@ GType            shell_global_get_type            (void) G_GNUC_CONST;
 
 ShellGlobal *shell_global_get (void);
 
+void
+shell_global_set_stage_input_area (ShellGlobal *global,
+                                   int          x,
+                                   int          y,
+                                   int          width,
+                                   int          height);
+
 void _shell_global_set_plugin (ShellGlobal  *global,
 			       MutterPlugin *plugin);