explicitly disable rust.lld on the vanilla LLVM builders

It's not really needed because using an external LLVM disables LLD,
but it will ensure that things are tested without lld explicitly.

Author: lqd

src/ci/docker/host-x86_64/x86_64-gnu-llvm-17/Dockerfile

@@ -54,7 +54,8 @@ ENV RUST_CONFIGURE_ARGS \
       --build=x86_64-unknown-linux-gnu \
       --llvm-root=/usr/lib/llvm-17 \
       --enable-llvm-link-shared \
-      --set rust.thin-lto-import-instr-limit=10
+      --set rust.thin-lto-import-instr-limit=10 \
+      --set rust.lld=false
 
 COPY host-x86_64/dist-x86_64-linux/shared.sh /scripts/
 COPY host-x86_64/dist-x86_64-linux/build-gccjit.sh /scripts/

src/ci/docker/host-x86_64/x86_64-gnu-llvm-18/Dockerfile

@@ -51,7 +51,8 @@ ENV RUST_CONFIGURE_ARGS \
       --build=x86_64-unknown-linux-gnu \
       --llvm-root=/usr/lib/llvm-18 \
       --enable-llvm-link-shared \
-      --set rust.thin-lto-import-instr-limit=10
+      --set rust.thin-lto-import-instr-limit=10 \
+      --set rust.lld=false
 
 COPY host-x86_64/dist-x86_64-linux/shared.sh /scripts/
 COPY host-x86_64/dist-x86_64-linux/build-gccjit.sh /scripts/