Simplifed python setup.py call in os-llvm-sycl-build workflow

Author: oleksandr-pavlyk

.github/workflows/os-llvm-sycl-build.yml

@@ -97,6 +97,6 @@ jobs:
           export OCL_ICD_FILENAMES=libintelocl.so:libintelocl_emu.so
           clang++ --version
           sycl-ls
-          python setup.py develop -- -G Ninja -DCMAKE_C_COMPILER:PATH=clang -DCMAKE_CXX_COMPILER:PATH=clang++
+          CC=clang CXX=clang++ python setup.py develop -G Ninja
           python -c "import dpctl; dpctl.lsplatform()" || exit 1
           SYCL_ENABLE_HOST_DEVICE=1 python -m pytest -v dpctl/tests