When r241373 was merged, one file appears to have been missed from the

When r241373 was merged, one file appears to have been missed from the
commit.  Merge it:
        Remove undefined behavior from sranddev() and
        srandomdev(). This doesn't actually work
        with any modern C compiler:

        In particular, both clang and modern gcc
        verisons silently elide any xor operation
        with 'junk'.

No mergeinfo changes with this commit as r241475 already updated the
mergeinfo.

git-svn-id: svn://svn.freebsd.org/base/stable/8@248821 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f