ada: Fix missing call to Finalize_Protection for simple protected objects

ada: Fix missing call to Finalize_Protection for simple protected objects

There is a glitch in Exp_Ch7.Build_Finalizer causing the finalizer to do
nothing for simple protected objects.

The change also removes redundant calls to the Is_Simple_Protected_Type
predicate and fixes a minor inconsistency between Requires_Cleanup_Actions
and Build_Finalizer for this case.

gcc/ada/

	* exp_ch7.adb (Build_Finalizer.Process_Declarations): Remove call
	to Is_Simple_Protected_Type as redundant.
	(Build_Finalizer.Process_Object_Declaration): Do not retrieve the
	corresponding record type for simple protected objects. Make the
	flow of control more explicit in their specific processing.
	* exp_util.adb (Requires_Cleanup_Actions): Return false for simple
	protected objects present in library-level package bodies for the
	sake of consistency with Build_Finalizer and remove call to
	Is_Simple_Protected_Type as redundant.