Make all the regression tests pass on CI

[jarzec]

Make all the regression tests pass on CI:

• Update Clang 18 to 19 for the regression tests to avoid failures due to bugs in Clang 18.
• Fix failures of pure Cpp2 regression tests on Windows GitHub runners.
  • The tests fail due to:

    cpp2util.h(564): error C2065: 'EXIT_FAILURE': undeclared identifier`.
    

  • #include <cstdlib> for the same tests leads to errors of the kind:

    C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\ucrt\corecrt_math.h(444): error C2995: 'bool isfinite(_Ty) noexcept': function template has already been defined
    C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\ucrt\corecrt_math.h(444): note: see declaration of 'isfinite'
    C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\ucrt\corecrt_math.h(450): error C2995: 'bool isinf(_Ty) noexcept': function template has already been defined
    C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\ucrt\corecrt_math.h(450): note: see declaration of 'isinf'
    ...
    

  • The temporary solution to allow all tests to pass on CI before a better approach is found is simply:

    #ifndef EXIT_FAILURE
        #define EXIT_FAILURE 1
    #endif
    

• Update regression tests data accordingly:
  • Update line numbers within cpp2util.h for compilation failure messages.
  • Remove error message files for test that started to pass with Clang 19.
  • Add binary execution output files for the tests that started to pass.

[hsutter]

Thanks, including for the EXIT_FAILURE catch!