[Ada] Look at Others_Discrete_Choices for N_Others_Choice

[Pierre-Marie de Rodat]

When seeing if we have any static predicates in an "others" choice for a
case statement, look at and possibly update choices
Others_Discrete_Choices.

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

gcc/ada/

	* exp_util.adb (Expand_Static_Predicates_In_Choices): Handle
	Others_Discrete_Choices in N_Others_Choice.
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