[Ada] Remove suppression for overlapping actuals in internal units

[Pierre-Marie de Rodat]

Detection of overlapping actuals was suppressed for internal units,
because we were getting spurious warnings on container units. Now this
suppression has no effect (most likely because ignore parameters of
generic types).

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

2020-06-12  Piotr Trojanek  <trojanek@adacore.com>

gcc/ada/

	* sem_warn.adb (Warn_On_Overlapping_Actuals): Remove suppression
	for internal units.
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