It looks like the musl target will, at some point, default to be dynamically linked. This config knob should make it so that it's always statically linked. Ref https://github.com/rust-lang/compiler-team/issues/422 Ref https://github.com/rust-lang/compiler-team/issues/422#issuecomment-812135847
Before this change, rg.exe depended on vcruntime140.dll, which does not exist on a fresh install of Windows. Closes #1613