Pull request for inclusion in `unix' module of fsync(2), fdatasync(2), posix_fadvise(2) and posix_fallocate(2)

[Sven Panne]

2013/12/27 Ricardo Catalinas Jiménez <jimenezrick at gmail.com>:
> OK, all the new functions are conditionally exported. Branch and ticket
> updated.

Hmmm, I don't really like conditional exports in libraries, because
you have no clue in advance if things will compile or not. How is one
supposed to check for this? Do we have a 'hautoconf'' ? :-} I know
that there are already conditional exports, but this doesn't make it
better.