[CMake] Merge "VS: Use full path to sources to allow deeper trees with VS >= 10" fix to release

[Chuck Atkins]

>
> The next major release will likely be CMake 3.1 -- and the fix you've
> found will be in that release automatically, as it will be based on
> 'master' when it is created.
>
>
Related, it should also include support for extended length paths at the
cmake level.  This converts paths to the special
\\?\D:\foo1\...\foo90\...\fooetc.\bar syntax for cmake filesystem commands
like rmdir, delete, etc., which lets Windows operate on paths up to 32k in
length.  It's yet to be tested though as to whether or not the extended
length path syntax can work inside generators.
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