Patch from Andreas Gruenbacher <agruen@suse.de>

The setxattr inode operation is defined like this in 2.4 and 2.5:

        int (*setxattr) (struct dentry *dentry, const char *name,
                         void *value, size_t size, int flags);

the original type of the value parameter was `const void *'; the const
obviously has been lost at some point. The definition should be:

        int (*setxattr) (struct dentry *dentry, const char *name,
                         const void *value, size_t size, int flags);