[clang] [llvm] [clang][python][test] Move python binding tests to lit framework (PR #148802)

DeinAlptraum wrote: Next attempt after https://github.com/llvm/llvm-project/pull/146844. The only change is, that I added a `UNSUPPORTED` directive for s390x after the discussion on that PR. (see comment https://github.com/llvm/llvm-project/pull/146844#issuecomment-3048291798) https://github.c

[clang] [llvm] [clang][python][test] Move python binding tests to lit framework (PR #146844)

DeinAlptraum wrote: I couldn't reproduce the issue when cross-compiling for s390x with my system GCC (15.1.1): ```bash cmake -G Ninja -B build -S llvm -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ \ -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=True \ '-DLLVM_LIT_ARGS='"'"'-v -j

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