[Ada] gnatbind: Fix No_Entry_Calls_In_Elaboration_Code message

[Pierre-Marie de Rodat]

This patch fixes a bug where gnatbind would suggest adding the
No_Entry_Calls_In_Elaboration_Code restriction, when that restriction is
already present.

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

gcc/ada/

	* bindo-diagnostics.adb (Output_Invocation_Related_Suggestions):
	Use Cumulative_Restrictions.Set, because Restriction_Active only
	works at compile time.
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