[Ada] Ada2020: matching parentheses and brackets

[Pierre-Marie de Rodat]

This patch fixes a bug where the compiler allowed mismatched brackets
and parentheses in aggregates in -gnatX mode, as in (...] and [...).

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

gcc/ada/

	* par-ch4.adb (P_Aggregate_Or_Paren_Expr): Require matching
	parens or brackets.
	* par.adb, par-tchk.adb (T_Right_Bracket): New procedure to give
	an error on missing ].
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