[Ada] Adapt Is_Actual_Parameter to also work for entry parameters

[Pierre-Marie de Rodat]

Routine Is_Actual_Parameter now also detects entry parameters; this
change is harmless for GNAT and allows this routine to be reused in
GNATprove.

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

gcc/ada/

	* sem_util.ads (Is_Actual_Parameter): Update comment.
	* sem_util.adb (Is_Actual_Parameter): Also detect entry parameters.
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