unix: clean up uv_fs_open() O_CLOEXEC logic
unix: clean up uv_fs_open() O_CLOEXEC logic

Move the logic out of uv__fs_work() and into a function of its own.

PR-URL: https://github.com/libuv/libuv/pull/326
Reviewed-By: Saúl Ibarra Corretgé <8a7991f6950ea189abf159d6ec98d2fcc13dc5f6@gmail.com>

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso