[Ada] AI12-0260 Functions Is_Basic and To_Basic in Wide_Characters.Handling

[Pierre-Marie de Rodat]

This Ada 202x AI introduces new functions Is_Basic and To_Basic in
Ada.Wide_Characters.Handling.

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

2020-06-15  Arnaud Charlet  <char...@adacore.com>

gcc/ada/

        * libgnat/a-wichha.ads, libgnat/a-wichha.adb,
        libgnat/a-wichun.ads, libgnat/a-wichun.adb (Is_Basic, To_Basic):
        New.
        * libgnat/s-utf_32.ads, libgnat/s-utf_32.adb (Is_UTF_32_Basic,
        To_UTF_32_Basic, Decomposition_Search): New subprograms.
        (Unicode_Decomposition): New table.

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