We used to count protected entries by iterating over component
declarations, but then switched to iterating over entities and
left some code that is no longer needed. Cleanup; semantics is
unaffected (maybe except fixing an assertion failure in developer
builds when there is pragma among entry family declarations).

gcc/ada/

	* exp_ch9.adb
	(Build_Entry_Count_Expression): Remove loop over component declaration;
	consequently remove a parameter that is no longer used; adapt callers.
	(Make_Task_Create_Call): Refine type of a local variable.