Resolve issues with GPA on Mesa for Apitrace

[janesma]

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The rtti & clashes commits only exist because I am linking statically. I can understand if you don't want to take those patches, but it is easier for me to link statically.

There are many things that I didn't test/fix for the build, like the linking to a precompiled gtest lib. That's simply not the way you want to manage external dependencies on linux.

Other cross-platform projects that I have worked on use CMake or Meson for cross-platform build support. Typically, they realize right away that maintaining the build in CMake is superior to checking in Visual Studio projects to perforce.