don't use default script

Author: marcoieni

src/ci/docker/host-x86_64/i686-gnu/Dockerfile

@@ -25,12 +25,4 @@ RUN sh /scripts/sccache.sh
 
 ENV RUST_CONFIGURE_ARGS --build=i686-unknown-linux-gnu
 ARG SCRIPT_ARG
-# Skip some tests that are unlikely to be platform specific, to speed up
-# this slow job.
-ENV DEFAULT_SCRIPT python3 ../x.py --stage 2 test \
-  --skip src/bootstrap \
-  --skip tests/rustdoc-js \
-  --skip src/tools/error_index_generator \
-  --skip src/tools/linkchecker
-# Set SCRIPT to SCRIPT_ARG if defined, otherwise set SCRIPT to DEFAULT_SCRIPT
-ENV SCRIPT=${SCRIPT_ARG:-$DEFAULT_SCRIPT}
+ENV SCRIPT=${SCRIPT_ARG}