[Ada] No project level attribute Main_Language

[Arnaud Charlet]

Project level attribute Main_Language, as it is not used by any
project-aware tool, is removed from the list of recognized
attributes.

Tested on x86_64-pc-linux-gnu, committed on trunk

2010-06-22  Vincent Celier  <celier@adacore.com>

	* prj-attr.adb: Remove project level attribute Main_Language.

-------------- next part --------------
Index: prj-attr.adb
===================================================================
--- prj-attr.adb	(revision 161073)
+++ prj-attr.adb	(working copy)
@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 B o d y                                  --
 --                                                                          --
---          Copyright (C) 2001-2009, Free Software Foundation, Inc.         --
+--          Copyright (C) 2001-2010, Free Software Foundation, Inc.         --
 --                                                                          --
 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
 -- terms of the  GNU General Public License as published  by the Free Soft- --
@@ -71,7 +71,6 @@ package body Prj.Attr is
    "SVRproject_dir#" &
    "lVmain#" &
    "LVlanguages#" &
-   "SVmain_language#" &
    "Lbroots#" &
    "SVexternally_built#" &