Avoid listing files twice
    
    This should solve this warning:
    
    ```
    RPM build warnings:
        File listed twice: /usr/lib64/cmake/clang/AddClang.cmake
        File listed twice: /usr/lib64/cmake/clang/ClangConfig.cmake
        File listed twice: /usr/lib64/cmake/clang/ClangConfigVersion.cmake
        File listed twice:
    /usr/lib64/cmake/clang/ClangTargets-relwithdebinfo.cmake
        File listed twice: /usr/lib64/cmake/clang/ClangTargets.cmake
        absolute symlink: /usr/bin/clang-format-diff ->
    /usr/share/clang/clang-format-diff.py
        File listed twice:
    /usr/lib/clang/19/include/fuzzer/FuzzedDataProvider.h
        File listed twice: /usr/lib/clang/19/include/orc/c_api.h
        File listed twice:
    /usr/lib/clang/19/include/profile/InstrProfData.inc
        File listed twice:
    /usr/lib/clang/19/include/profile/instr_prof_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/allocator_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/asan_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/common_interface_defs.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/coverage_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/dfsan_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/hwasan_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/linux_syscall_hooks.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/lsan_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/memprof_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/msan_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/netbsd_syscall_hooks.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/scudo_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/tsan_interface.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/tsan_interface_atomic.h
        File listed twice:
    /usr/lib/clang/19/include/sanitizer/ubsan_interface.h
        File listed twice: /usr/lib/clang/19/include/xray/xray_interface.h
        File listed twice:
    /usr/lib/clang/19/include/xray/xray_log_interface.h
        File listed twice: /usr/lib/clang/19/include/xray/xray_records.h
        File listed twice: /usr/lib/clang/19/share/asan_ignorelist.txt
        File listed twice: /usr/lib/clang/19/share/cfi_ignorelist.txt
    ```