New comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/pull/53096#issuecomment-2482112865

Comment:
could these be cleaned up?
```
CMake Warning:
  Manually-specified variables were not used by the project:

    BASE_LLVM_VERSION
    LIBC_WNO_ERROR
    LLDB_USE_SYSTEM_SIX
    LLVM_EXTERNAL_SPIRV_HEADERS_SOURCE_DIR
    OFFLOAD_INSTALL_LIBDIR
```