[CMake] Renaming cache variables and forcing a "cleanup"

[Robert Dailey]

Currently other members on my project have a variable in their cache named
FOO_BAR. I renamed it to Some_Foo_Bar. It would be unmanageable to have to
create a conference call or send out an email to everyone saying "Hey,
delete your cache!". How can I programmatically force this variable to be
renamed, while still retaining its previous value? Of course I could do
this:
option( Some_Foo_Bar "Does a lot of foo..." )

if( FOO_BAR )
  set( Some_Foo_Bar ${FOO_BAR} )
  unset( FOO_BAR CACHE )
endif()

But is this the recommended path?
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