[Ada] AI12-0144 Make Discrete_Random more flexible

[Pierre-Marie de Rodat]

A new version of Random is provided to provide more flexibility on the
range of values returned, see the Ada AI for more details.

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

2020-06-05  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* libgnat/a-nudira.ads, libgnat/a-nudira.adb (Random): New
	function.
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