Bug#973647: libc-bin: iconv does not support C.UTF-8

[Vincent Lefevre <vincent@vinc17.net>]

On 2020-11-02 20:41:02 +0100, Vincent Lefevre wrote:
> With en_US.utf8, no issues:
> 
> $ export LC_ALL=en_US.utf8
> $ echo a─b | iconv -f utf-8 -t ascii//TRANSLIT
> a-b
> 
> But with C.UTF-8, the character "─" is regarded as invalid:
> 
> $ export LC_ALL=C.UTF-8
> $ echo a─b | iconv -f utf-8 -t ascii//TRANSLIT
> aiconv: illegal input sequence at position 1

Note that this is not related to the charset used by the file,
but the locale under which iconv runs. For instance, there is
no issue to convert a UTF-8 files under the C locale, but using
C.UTF-8 instead yields an error:

$ echo a─b | LC_ALL=C iconv -f utf-8 -t ascii//TRANSLIT
a-b
$ echo a─b | LC_ALL=C.UTF-8 iconv -f utf-8 -t ascii//TRANSLIT
aiconv: illegal input sequence at position 1

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