[CMake] Patch for Sphinx warning message

[Andrew Maclean]

This patch fixes this warning when building CMake from the master:
"WARNING: 'default' html theme has been renamed to 'classic'. Please change
your html_theme setting either to the new 'alabaster' default theme, or to
'classic' to keep using the old default."

It ensures that the "classic" theme is used for versions greater then 1.2
and "default" otherwise.

Regards
    Andrew
-- 
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Andrew J. P. Maclean

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