Early in the morning, strrev() looks like a more difficult problem than it

really is. It's actually quite simple. In fact, the only magical thing about
Bob's version was the way it swapped variables without using any temporary
variable. Rewrote the function to use our SWAP() instead, since that actually
makes it readable. Moved it to util.cpp (outside the Common namespace, for
consistency with scumm_stricmp()) since Kirben knew of other places where it
could be used.

svn-id: r28231

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