[Ada] Delete symbolic link silently.

[Ada] Delete symbolic link silently.

[Arnaud Charlet]

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The following test must run without raising an exception on
systems supporting symbolic links:

with Ada.Directories; use Ada.Directories;
with Ada.Text_IO;     use Ada.Text_IO;
procedure Delln is
   F1   : constant String := "libname.so";
   F2   : constant String := "libname.so.1";
   File : File_Type;
begin
   Delete_File (F1);
   Delete_File (F2);
end Delln;

 $ touch libname.so
 $ ln -s libname.so libname.so.1
 $ gnatmake -a delln

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

2012-06-12  Pascal Obry  <obry@adacore.com>

	* a-direct.adb (Delete_File): Delete symbolic links silently
	instead of raising the Name_Error exception when the symbolic
	link is pointing to a non existent file.


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Index: a-direct.adb
===================================================================
--- a-direct.adb	(revision 188428)
+++ a-direct.adb	(working copy)
@@ -31,20 +31,20 @@
 
 with Ada.Calendar;               use Ada.Calendar;
 with Ada.Calendar.Formatting;    use Ada.Calendar.Formatting;
+with Ada.Characters.Handling;    use Ada.Characters.Handling;
 with Ada.Directories.Validity;   use Ada.Directories.Validity;
+with Ada.Strings.Fixed;
 with Ada.Strings.Maps;           use Ada.Strings.Maps;
-with Ada.Strings.Fixed;
 with Ada.Strings.Unbounded;      use Ada.Strings.Unbounded;
 with Ada.Unchecked_Conversion;
 with Ada.Unchecked_Deallocation;
-with Ada.Characters.Handling;    use Ada.Characters.Handling;
 
+with System;              use System;
 with System.CRTL;         use System.CRTL;
+with System.File_IO;      use System.File_IO;
 with System.OS_Constants; use System.OS_Constants;
 with System.OS_Lib;       use System.OS_Lib;
 with System.Regexp;       use System.Regexp;
-with System.File_IO;      use System.File_IO;
-with System;              use System;
 
 package body Ada.Directories is
 
@@ -561,7 +561,9 @@
       if not Is_Valid_Path_Name (Name) then
          raise Name_Error with "invalid path name """ & Name & '"';
 
-      elsif not Is_Regular_File (Name) then
+      elsif not Is_Regular_File (Name)
+        and then not Is_Symbolic_Link (Name)
+      then
          raise Name_Error with "file """ & Name & """ does not exist";
 
       else