Brad King 1cd3752729 cmCacheManager: Avoid cache entry self-assignment
Since commit bef93dc5 (Couple of changes: cache variables now have a map
of properties, 2002-09-11) the cmCacheManager::AddCacheDefinition method
accesses its map entry by reference.  However, the commit left the
original entry assignment at the end of the method.  With Apple Clang
5.1 and libc++ this self-assignment destroys the cache entry property
map.

Drop the self assignment.  Also drop the condition around the call to
UnwatchUnusedCli since it was a self-comparison that must always have
been true.
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