Configure dist builder in the right spot.

Author: khuey

src/bootstrap/defaults/config.dist.toml

@@ -11,7 +11,6 @@ extended = true
 # Most users installing from source want to build all parts of the project from source.
 [llvm]
 download-ci-llvm = false
-libzstd = if linux { true } else { false }
 [rust]
 # We have several defaults in bootstrap that depend on whether the channel is `dev` (e.g. `omit-git-hash` and `download-ci-llvm`).
 # Make sure they don't get set when installing from source.

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -83,6 +83,7 @@ ENV RUST_CONFIGURE_ARGS \
       --set target.x86_64-unknown-linux-gnu.ranlib=/rustroot/bin/llvm-ranlib \
       --set llvm.thin-lto=true \
       --set llvm.ninja=false \
+      --set llvm.libzstd=true \
       --set rust.jemalloc \
       --set rust.use-lld=true \
       --set rust.lto=thin \