[Patch] Don't include <fstream> in include/ext/stdio_sync_filebuf.h

[Paolo Carlini]

Pétur Runólfsson wrote:

>Yes, only <cstdio> (for FILE, getc, etc.), <cwchar> (for getwc etc.)
>and <streambuf> should be needed.
>
Agreed.
I'm committing the below (already fully tested), in preparation for 12077...

Paolo.

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