* Add air_conf backend to compilation list

        For openaadl/ocarina#160

projects/ocarina-backends.gpr

@@ -6,7 +6,7 @@
 --                                                                          --
 --                              P r o j e c t                               --
 --                                                                          --
---    Copyright (C) 2007-2009 Telecom ParisTech, 2010-2017 ESA & ISAE.      --
+--    Copyright (C) 2007-2009 Telecom ParisTech, 2010-2018 ESA & ISAE.      --
 --                                                                          --
 -- Ocarina  is free software; you can redistribute it and/or modify under   --
 -- terms of the  GNU General Public License as published  by the Free Soft- --
@@ -39,6 +39,7 @@ project Ocarina.Backends is
    for Source_Dirs use (Src_Dir, Build_Dir,
    Src_Dir & "/aadl_pp",
    Src_Dir & "/aadl_xml",
+   Src_Dir & "/air_conf",
    Src_Dir & "/alloy",
    Src_Dir & "/arinc653",
    Src_Dir & "/arinc653_conf",