il2cpp-api-functions.h is empty

[krulci]

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2. Attach global-metadata.dat and the IL2CPP binary to the issue.

To submit an issue for behavioral bugs (eg. incorrect outputs, options not working as expected, broken features etc.):

1. Provide a clear and concise description of the bug.
   identifier "il2cpp_thread_attach" is undefined
   il2cpp-api-functions.h is empty
2. Provide the exact steps you took to produce the bug, so that we can reproduce it ourselves.
   https://drive.google.com/file/d/12QnYMVDcDqE8hVMfVj3ho6eLLdGrxRwR/view?usp=sharing
   This is the metadata and so files.
   The address is 983e2000.
   The unity version is 2018.4.30f1
   I seletec C++ scaffolding / DLL injection project
   The options were 2018.4.18-2018.4.31 and MSVC
   Then I clicked export
   The result il2cpp-api-functions.h is empty, leading to identifier "il2cpp_thread_attach" is undefined.
   Is this supposed to be empty and added manually?
   I checked other project such as the Among Us Menu.
   The il2cpp-api-functions.h does have the APIs.
   Issues not meeting these criteria will be automatically closed and tagged as invalid.