[Ada] Spurious error caused by order of interfaces in full view

[Pierre-Marie de Rodat]

The frontend reports a spurious error when the order of interfaces
differ between the full view and the partial view of a private type
defined in a generic unit.

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

gcc/ada/

	* sem_ch3.adb (Reorder_Interfaces): When the conflicting
	interface is identified we just replace the interface in the
	list of interfaces of the tagged type (instead of adding a
	duplicate to the list of interfaces).
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