[bug-gnu-libiconv] 'ASMO-708' and 'ISO-8859-6' is same in libiconv

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Hi There,

  I found 'ASMO-708' and 'ISO-8859-6' is same in libiconv.

  But according to the description in Microsoft Learn

        
https://learn.microsoft.com/en-US/windows/win32/intl/code-page-identifiers

  ASMO-708 corresponds to CP708 "Arabic (ASMO 708)"
  ISO-8859-6 corresponds to CP28596 "ISO 8859-6 Arabic"

  According to the description in wutils.com

        https://wutils.com/encodings/asmo-708
        https://wutils.com/encodings/iso-8859-6

  It can be seen that the encoding tables of the two are somewhat different.

  However, according to the definition in "lib/encodings.def" in libiconv, the 
two are the same encoding.

  Hope you can help resolve this.

Thank you.