Vladimir Vishnevsky adeaa43ad3 libstdc++: Fix build failure for targets without unistd.h
The patch fixes build issues occurring if build parameter
"--enable-cstdio=stdio_pure" is specified and no unistd.h is
present in the environment.

libstdc++-v3/ChangeLog:

	* include/ext/stdio_sync_filebuf.h: Remove unused <unistd.h>.
	* src/c++17/fs_ops.cc (fs::permissions): Qualify mode_t.
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