Buidling xorg-modular failds, libLLVM fails on musl-based systems: "error: '::lseek64' has not been declared; did you mean 'lseek'?"

[MarcCoquand]

Hi

When trying to build libLLVM, it fails with the error

/src/pkgsrc/lang/libLLVM/work/llvm-13.0.1.src/lib/Support/raw_ostream.cpp: In member function 'uint64_t llvm::raw_fd_ostream::seek(uint64_t)':
/src/pkgsrc/lang/libLLVM/work/llvm-13.0.1.src/lib/Support/raw_ostream.cpp:807:11: error: '::lseek64' has not been declared; did you mean 'lseek'?

My suspicion is that this is caused by

llvm/llvm-project#60402

And therefore by bumping up to a later version of libLLVM, this should be resolved.