xattrs on symlinks

[Wesley W. Terpstra]

As we all know, only osx supports xattrs on symlinks. Unfortunately,  
not only does osx support xattrs on symlinks, *every* symlink has, at  
the least, com.apple.FinderInfo. When backing up to a linux system,  
this results in one error message per symlink:
rsync: rsync_xal_set: lsetxattr("User Guides And  
Information","user.com.apple.FinderInfo") failed: Operation not  
permitted (1)
rsync: rsync_xal_set: lsetxattr("User Guides And  
Information","user.com.apple.crtime96") failed: Operation not  
permitted (1)
rsync: rsync_xal_set: lsetxattr("etc","user.com.apple.FinderInfo")  
failed: Operation not permitted (1)
rsync: rsync_xal_set: lsetxattr("etc","user.com.apple.crtime96")  
failed: Operation not permitted (1)
rsync: rsync_xal_set: lsetxattr("mach","user.com.apple.FinderInfo")  
failed: Operation not permitted (1)
rsync: rsync_xal_set: lsetxattr("mach","user.com.apple.crtime96")  
failed: Operation not permitted (1)

Although I usually advocate keeping meta-data, in this case I think  
it would be better to just drop it. Copying them from osx to osx is  
ok, though. An unfortunate consequence of this is that meta-data for  
symlink ownership is lost when using fake super on linux, but that  
was already the case.

Patch to ignore extended attributes on symlinks for non-osx platforms  
attached.
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