fix(build): fix unable to partially compile

lin

2025-04-25 6a7002bcc41716f11f4ca7eb68ebd06c18fdd5e8

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if (LLVM_ENABLE_SPHINX)
  include(AddSphinxTarget)
  if (SPHINX_FOUND)
    if (${SPHINX_OUTPUT_HTML})
      add_sphinx_target(html libcxx)
    endif()
  endif()
endif()