[Ada] Record components do not appear in the Global contract

[Pierre-Marie de Rodat]

In the Global contract there can be only entire objects, which are
represented either as N_Identifier or N_Expanded_Name. The test for
record components was dead. Now removed. Semantics unaffected.

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

2018-11-14  Piotr Trojanek  <trojanek@adacore.com>

gcc/ada/

	* sem_util.adb (First_From_Global_List): Do not expect
	N_Selected_Component in the Global contract; simplify assertion
	with Nam_In.
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