[Ada] remove unnecessary restriction in stand alone project file

[Arnaud Charlet]

Tested on i686-linux, committed on HEAD

The limitation that the library symbol file and the library reference
symbol file could not be the same is removed, because it is not a problem
if these two files are the same.
The test for this is, on VMS, to build a Stand-Alone Library with the
same file for both Library_Symbol_File and
Library_Reference_Symbol_File.

2005-03-29  Vincent Celier  <celier@adacore.com>

	* prj-nmsc.adb (Check_Stand_Alone_Library): Do not forbid the symbol
	file and the reference symbol file to be the same file.

-------------- next part --------------
Index: prj-nmsc.adb
===================================================================
RCS file: /cvs/gcc/gcc/gcc/ada/prj-nmsc.adb,v
retrieving revision 1.33
diff -u -p -r1.33 prj-nmsc.adb
--- prj-nmsc.adb	18 Mar 2005 11:49:47 -0000	1.33
+++ prj-nmsc.adb	29 Mar 2005 15:37:35 -0000
@@ -2466,32 +2466,6 @@ package body Prj.Nmsc is
                      Lib_Ref_Symbol_File.Location);
                end if;
 
-               --  Check that the reference symbol file and the symbol file
-               --  are not the same file.
-
-               if Data.Symbol_Data.Symbol_File /= No_Name then
-                  declare
-                     Symbol    : String :=
-                       Get_Name_String
-                         (Data.Symbol_Data.Symbol_File);
-
-                     Reference : String :=
-                       Get_Name_String
-                         (Data.Symbol_Data.Reference);
-
-                  begin
-                     Canonical_Case_File_Name (Symbol);
-                     Canonical_Case_File_Name (Reference);
-
-                     if Symbol = Reference then
-                        Error_Msg
-                          (Project, In_Tree,
-                           "reference symbol file and symbol file " &
-                           "cannot be the same file",
-                           Lib_Ref_Symbol_File.Location);
-                     end if;
-                  end;
-               end if;
             end if;
          end if;
       end if;