Commits on Jun 16, 2021

1. curl_multibyte: Remove local encoding fallbacks …

   - If the UTF-8 to UTF-16 conversion fails in Windows Unicode builds then
     no longer fall back to assuming the string is in a local encoding.
   
   Background:
   
   Some functions in Windows Unicode builds must convert UTF-8 to UTF-16 to
   pass to the Windows CRT API wide-character functions since in Windows
   UTF-8 is not a valid locale (or at least 99% of the time right now).
   
   Prior to this change if the Unicode encoding conversion failed then
   libcurl would assume, for backwards compatibility with applications that
   may have written their code for non-Unicode builds, attempt to convert
   the string from local encoding to UTF-16.
   
   That type of "best effort" could theoretically cause some type of
   security or other problem if a string that was locally encoded was also
   valid UTF-8, and therefore an unexpected UTF-8 to UTF-16 conversion
   could occur.
   
   Ref: curl#7246
   
   Closes #xxxx

   

   jay committed Jun 16, 2021
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