With an external toolchain that's all LLVM 16 including the binutils,
the build fails because lld doesn't like versions for undefined syms:
ld.lld: error: version script assignment of 'FBSD_1.7' to symbol '__vdso_ia32_osigcode' failed: symbol not defined
ld.lld: error: version script assignment of 'FBSD_1.7' to symbol '__vdso_lcall_tramp' failed: symbol not defined
We have to preprocess the linker script to fix this.
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