ln -P/-L and linkat

[Eric Blake]

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Now that POSIX 2008 requires ln to support user choice of whether to
create hard links to symlinks, we can probably get rid of
ENABLE_HARD_LINK_TO_SYMLINK_WARNING in the ln.c source code.  I noticed
this while considering how to implement linkat in gnulib.  I guess
platforms that follow link() by default will just have to fail with ENOSYS
since they don't support -P (and keep their default of -L), while systems
like GNU/Linux that have always behaved like -P are now justified.  Do we
want to make ln's behavior conditional on _POSIX2_VERSION (where
conformance to 2001 tries to imply -L, even on Linux where it is more
natural to imply -P), or is it not worth worrying about?

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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