[Ada] Improve error message on illegal prefixed procedure call

[Pierre-Marie de Rodat]

This patch improves an error message on an illegal prefixed procedure
call Obj.Name (Args) when Name denotes a visible component of Obj, as
well as a primitive operation of the type of Obj.

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

gcc/ada/

	* sem_ch6.adb (Analyze_Call_And_Resolve): Add information to the
	error message on an illegal procedure call, when the illegality
	is due to the presence of a component of the full view of the
	target object, as well as a procedure with the same name (See RM
	4.1.3 (9.2/3)).
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