xattr missing for MacOSX

[Wayne Davison]

On Mon, Apr 30, 2007 at 12:32:59AM +0200, Alan Snelgrove wrote:
> The latest rsync change disables xattr when there is no lgetxattr()  
> function.

That was just configure's guessing code when the user didn't specify
either --enable-xattr-support or --disable-xattr-support.  I have
improved this code further so that it should guess if the xattr
libraries are around correctly on both OS X and FreeBSD.

..wayne..