[Ada] Allow attributes Version and Body_Version prefixed by entries

[Ada] Allow attributes Version and Body_Version prefixed by entries

gcc/ada/

	* sem_attr.adb (Check_Program_Unit): Replace tests for Task_Kind
	and Protected_Kind with a collective test for Concurrent_Kind;
	likewise, replace calls to Is_Task_Type and Is_Protected_Type
	with a collective call to Is_Concurrent_Type; simplify into a
	single membership test; add missing Entry_Kind alternative.