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[Ada] Clarify message for missing pragma argument identifier

This patch clarifies the message for a missing pragma argument
identifier, as shown by this test program:

     1. pragma Restrictions
     2.   (Max_asynchronous_select_nesting => 0,
     3.    No_task_hierarchy);
           |
        >>> pragma argument identifier required here
        >>> since previous argument had identifier (RM 2.8(4))

     4. procedure PAI_Message is
     5. begin
     6.    null;
     7. end;

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

2010-06-14  Robert Dewar  <dewar@adacore.com>

	* par-ch2.adb (Scan_Pragma_Argument_Association): Clarify message for
	missing pragma argument identifier.

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