Remove -gnat05 switch.

Change-Id: Ia82675c82bb0db1a876269ceed00e71d527204a5

Author: godunko

docs/gtkada_rm/gtkada_documentation.gpr

@@ -4,7 +4,7 @@ project GtkAda_Documentation is
    for Object_Dir use "doc_obj";
 
    package Compiler is
-      for Default_Switches ("Ada") use ("-gnatc", "-gnatQ", "-gnat05");
+      for Default_Switches ("Ada") use ("-gnatc", "-gnatQ");
    end Compiler;
 
    package Builder is