Size mismatch warnings causing build failure

[Allofich]

Trying to build the latest code with Visual Studio 2022, I get warnings about vtable size mismatches between Jolt and OpenTESArena that are treated as errors. I also got the warnings previously, but they weren't treated as errors then. It might be related to the Jolt upgrade in 7b02511.

Changing this line in CMakeLists.txt:
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GR-")
to
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GR")
or commenting it out made the warnings disappear and allowed the build to complete.

[afritz1]

I believe I fixed it locally by turning on exceptions in Jolt, not by enabling runtime type info, but maybe this is better if it keeps it from happening to new builders.