[Mutt] #3148: Need local implementations for fgetwc, ungetwc, fputws

[Mutt <fleas@xxxxxxxx>]

#3148: Need local implementations for fgetwc, ungetwc, fputws
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 Reporter:  brendan  |       Owner:  mutt-dev
     Type:  defect   |      Status:  new     
 Priority:  major    |   Milestone:  1.6     
Component:  charset  |     Version:  1.5.19  
 Keywords:           |  
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 mutt has been using `fgetwc`, `ungetwc`, and `fputws` since [3e850c6e43fd]
 in order to fix #3033. Some systems (notably cygwin) don't provide these
 functions, so we need fallback code.

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Ticket URL: <http://dev.mutt.org/trac/ticket/3148>
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