[Ada] 'Switches (others) not recognized as a valid attribute reference

[Arnaud Charlet <charlet at adacore dot com>]

For associative array attributes where 'others' is allowed as the index
(such as Builder'Switches), an attribute reference with 'others' was not
recognized. This patch corrects this.

The test for this is to build the project prj.gpr below:

project Shared is
   for Source_Files use ();
   package Builder is
      for Switches (others) use ("-q");
   end Builder;
end Shared;

with "shared.gpr";
project Prj is
   for Main use ("main.adb");
   package Builder is
      for Switches (others) use Shared.Builder'Switches (others);
   end Builder;
end Prj;

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

2010-08-10  Vincent Celier  <celier@adacore.com>

	* prj-proc.adb (Get_Attribute_Index): If Index is All_Other_Names,
	returns Index.
	* prj-strt.adb (Attribute_Reference): Recognize 'others' as a valid
	index for an associative array where it is allowed.

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