Import xorg-gtest project

Merged Povilas Kanapickas requested to merge p12tic/xorg-integration-tests:import-gtest into master

This MR imports the xorg-gtest project as a subdirectory.

This is a minimal MR just to get the build and tests working. The project structure will be improved in subsequent MRs.

Autotools support has been removed as part of this MR as it does not make sense to invest time upgrading it.

Edited by Povilas Kanapickas

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