autodoc build step

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Steps to reproduce (Zig 0.12.0-dev.21+ac95cfe44, newer versions should work too):

git clone https://github.com/hexops/mach
git checkout autodoc
cd mach/
zig build docs

That fails with a very vague error command terminated unexpectedly with no other explanation:

Build Summary: 16/19 steps succeeded; 1 failed (disable with --summary none)
docs transitive failure
└─ install generated/ transitive failure
   └─ zig build-exe mach Debug native failure

Full output: https://gist.githubusercontent.com/slimsag/5056d0b7d041d0c4f3dc27cd3ea12816/raw/de74197878f914c4c6aa494ac27e3434f0f57882/output.txt

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#1038