x/text/encoding/charmap: support for code page 1125 aka cp866u

[yukal]

Add Ukrainian government standard (RST 2018-91) for DOS, based on common
alternative encoding, but different from cp866 in 0xF2-0xF9

Fixes #69779

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Patch Set 1:

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Message from Ian Lance Taylor:

Patch Set 2:

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Message from Ian Lance Taylor:

Patch Set 4: Commit-Queue+1

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Patch Set 4:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-10-04T20:16:36Z","revision":"765a3662ddad6feca2080c14cd059cac2968fdad"}

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Patch Set 4: -Commit-Queue

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Patch Set 4: LUCI-TryBot-Result+1

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Patch Set 4: Code-Review+1

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Message from Alex Yu:

Patch Set 6:

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Patch Set 6:

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Patch Set 6:

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Patch Set 6: Code-Review+1

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