[CMake] FindGTest patch

[Stephan Menzel]

Hi,

please correct me if I'm wrong but in my impression the existing
FindGTest module is rather ignorant about finding 64 bit builds on
windows. It also doesn't handle Debug/Release linking very well. Also
it appears not to be quite consistent with it's API description.
Please find a patch attached that solves at least some of those
problems for your consideration.

In my tests it worked as described on Linux and Windows 32 and 64 bit,
the latter after having GTEST_ROOT set.

Cheers,
Stephan
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