[issue39640] fall back os.fdatasync() to fsync() on POSIX systems without fdatasync() support

[George Melikov]

George Melikov <mail at gmelikov.ru> added the comment:

I want to add that it's a usual practice:
- https://github.com/libuv/libuv/pull/1580/files/bdd987a9b4347164e31e22d2d5ce06fbb5ebc859
- https://rev.ng/gitlab/revng/qemu/commit/6f1953c4c14566d3303709869fd26201828b3ccf

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