Create src/vhdl subdirectory.

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diff --git a/src/vhdl/post_sems.ads b/src/vhdl/post_sems.ads
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+--  Global checks after semantization pass.
+--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
+--
+--  GHDL is free software; you can redistribute it and/or modify it under
+--  the terms of the GNU General Public License as published by the Free
+--  Software Foundation; either version 2, or (at your option) any later
+--  version.
+--
+--  GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+--  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+--  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+--  for more details.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with GHDL; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+with Iirs; use Iirs;
+
+package Post_Sems is
+   --  Do post semantization checks, such as VITAL checks.
+   --  This procedure is also used to extract declarations from ieee
+   --  packages.
+   procedure Post_Sem_Checks (Unit : Iir_Design_Unit);
+end Post_Sems;